1
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Pitié S, Wang B, Guégan F, Frapper G. Predicted High-Energy Density MN 8 Containing Anionic 18-Crown-6 Ring-Based Polynitrogen Monolayers Acting as Cryptand. Inorg Chem 2024; 63:7293-7302. [PMID: 38605465 DOI: 10.1021/acs.inorgchem.4c00173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/13/2024]
Abstract
In this study, we investigate the potential of the 18-crown-6-like two-dimensional (2D)-N8 structure to accommodate electrons from metals without compromising its covalent nitrogen network. Employing the crystal structure prediction enhanced by evolutionary algorithm and density functional theory methodology, we successfully predicted the existence of 16 layered M@2D-N8 complexes from a total of 39 MN8 systems investigated at 100 GPa (M = s-block Na-Cs, Be-Ba and d-block Ag, Au, Cd, Hg, Hf, W, and Y). Among those, there are 13 quenchable M@2D-N8 compounds that are dynamically stable at 1 atm. Orbital interactions and bonding analysis show that 2D-N8 presents a flat localized π* band that can accommodate one or two electrons without breaking the 2D covalent nitrogen network. Depending on the metal-to-polynitrogen charge transfer (formally, 1-4 electrons), these N-rich phases are semiconducting or metallic under ambient conditions. Ab initio molecular dynamics simulations show that K(I)@2D-N8 and Ca(II)@2D-N8 are thermally stable up to 600 K, while the Hf(IV)@2D-N8 compound is thermally not viable at 400 K because of the weakening of the N═N bonds due to a strong four-electron reduction. These metal 18-crown-6 ring-based polynitrogen compounds, as expected due to their high nitrogen content (eight nitrogen atoms per metal), could potentially serve as new high-energy density materials.
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Affiliation(s)
- Sylvain Pitié
- Applied Quantum Chemistry Group, E4 Team, IC2MP UMR 7285, Université de Poitiers─CNRS, Poitiers 86073, France
| | - Busheng Wang
- Applied Quantum Chemistry Group, E4 Team, IC2MP UMR 7285, Université de Poitiers─CNRS, Poitiers 86073, France
| | - Frédéric Guégan
- Applied Quantum Chemistry Group, E4 Team, IC2MP UMR 7285, Université de Poitiers─CNRS, Poitiers 86073, France
| | - Gilles Frapper
- Applied Quantum Chemistry Group, E4 Team, IC2MP UMR 7285, Université de Poitiers─CNRS, Poitiers 86073, France
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2
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Tan JH, Wang H, Chen YJ, Jiao N, Zheng MM, Lu HY, Zhang P. Superconductivity in Ca-intercalated bilayer graphene: C 2CaC 2. Phys Chem Chem Phys 2024; 26:11429-11435. [PMID: 38563510 DOI: 10.1039/d3cp06245g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
The deposition and intercalation of metal atoms can induce superconductivity in monolayer and bilayer graphenes. For example, it has been experimentally proved that Li-deposited graphene is a superconductor with critical temperature Tc of 5.9 K, Ca-intercalated bilayer graphene C6CaC6 and K-intercalated epitaxial bilayer graphene C8KC8 are superconductors with Tc of 2-4 K and 3.6 K, respectively. However, the Tc of them are relatively low. To obtain higher Tc in graphene-based superconductors, here we predict a new Ca-intercalated bilayer graphene C2CaC2, which shows higher Ca concentration than the C6CaC6. It is proved to be thermodynamically and dynamically stable. The electronic structure, electron-phonon coupling (EPC) and superconductivity of C2CaC2 are investigated based on first-principles calculations. The EPC of C2CaC2 mainly comes from the coupling between the electrons of C-pz orbital and the high- and low-frequency vibration modes of C atoms. The calculated EPC constant λ of C2CaC2 is 0.75, and the superconducting Tc is 18.9 K, which is much higher than other metal-intercalated bilayer graphenes. By further applying -4% biaxial compressive strain to C2CaC2, the Tc can be boosted to 26.6 K. Thus, the predicted C2CaC2 provides a new platform for realizing superconductivity with the highest Tc in bilayer graphenes.
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Affiliation(s)
- Jin-Han Tan
- School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China.
| | - Hao Wang
- School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China.
| | - Ying-Jie Chen
- School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China.
| | - Na Jiao
- School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China.
| | - Meng-Meng Zheng
- School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China.
| | - Hong-Yan Lu
- School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China.
| | - Ping Zhang
- School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China.
- Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
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3
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Lin YC, Matsumoto R, Liu Q, Solís-Fernández P, Siao MD, Chiu PW, Ago H, Suenaga K. Alkali metal bilayer intercalation in graphene. Nat Commun 2024; 15:425. [PMID: 38267420 DOI: 10.1038/s41467-023-44602-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Accepted: 12/21/2023] [Indexed: 01/26/2024] Open
Abstract
Alkali metal (AM) intercalation between graphene layers holds promise for electronic manipulation and energy storage, yet the underlying mechanism remains challenging to fully comprehend despite extensive research. In this study, we employ low-voltage scanning transmission electron microscopy (LV-STEM) to visualize the atomic structure of intercalated AMs (potassium, rubidium, and cesium) in bilayer graphene (BLG). Our findings reveal that the intercalated AMs adopt bilayer structures with hcp stacking, and specifically a C6M2C6 composition. These structures closely resemble the bilayer form of fcc (111) structure observed in AMs under high-pressure conditions. A negative charge transferred from bilayer AMs to graphene layers of approximately 1~1.5×1014 e-/cm-2 was determined by electron energy loss spectroscopy (EELS), Raman, and electrical transport. The bilayer AM is stable in BLG and graphite superficial layers but absent in the graphite interior, primarily dominated by single-layer AM intercalation. This hints at enhancing AM intercalation capacity by thinning the graphite material.
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Affiliation(s)
- Yung-Chang Lin
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8565, Japan.
- The Institute of Scientific and Industrial Research (ISIR-SANKEN), Osaka University, Osaka, 567-0047, Japan.
| | - Rika Matsumoto
- Department of Engineering, Tokyo Polytechnic University, 5-45-1 Iiyamaminami, Atsugi, Kanagawa, 243-0297, Japan
| | - Qiunan Liu
- The Institute of Scientific and Industrial Research (ISIR-SANKEN), Osaka University, Osaka, 567-0047, Japan
| | | | - Ming-Deng Siao
- Department of Electrical Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Po-Wen Chiu
- Department of Electrical Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 10617, Taiwan
| | - Hiroki Ago
- Global Innovation Center (GIC), Kyushu University, Fukuoka, 816-8580, Japan
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka, 816-8580, Japan
| | - Kazu Suenaga
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8565, Japan.
- The Institute of Scientific and Industrial Research (ISIR-SANKEN), Osaka University, Osaka, 567-0047, Japan.
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4
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Liu Q, Lin YC, Kretschmer S, Ghorbani-Asl M, Solís-Fernández P, Siao MD, Chiu PW, Ago H, Krasheninnikov AV, Suenaga K. Molybdenum Chloride Nanostructures with Giant Lattice Distortions Intercalated into Bilayer Graphene. ACS NANO 2023. [PMID: 38007700 DOI: 10.1021/acsnano.3c06958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2023]
Abstract
The nanospace of the van der Waals (vdW) gap between structural units of two-dimensional (2D) materials serves as a platform for growing unusual 2D systems through intercalation and studying their properties. Various kinds of metal chlorides have previously been intercalated for tuning the properties of host layered materials, but the atomic structure of the intercalants remains still unidentified. In this study, we investigate the atomic structural transformation of molybdenum(V) chloride (MoCl5) after intercalation into bilayer graphene (BLG). Using scanning transmission electron microscopy, we found that the intercalated material represents MoCl3 networks, MoCl2 chains, and Mo5Cl10 rings. Giant lattice distortions and frequent structural transitions occur in the 2D MoClx that have never been observed in metal chloride systems. The trend of symmetric to nonsymmetric structural transformations can cause additional charge transfer from BLG to the intercalated MoClx, as suggested by our density functional theory calculations. Our study deepens the understanding of the behavior of matter in the confined space of the vdW gap in BLG and provides hints at a more efficient tuning of material properties by intercalation for potential applications, including transparent conductive films, optoelectronics, and energy storage.
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Affiliation(s)
- Qiunan Liu
- The Institute of Scientific and Industrial Research (ISIR-SANKEN), Osaka University, Osaka 567-0047, Japan
| | - Yung-Chang Lin
- The Institute of Scientific and Industrial Research (ISIR-SANKEN), Osaka University, Osaka 567-0047, Japan
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
| | - Silvan Kretschmer
- Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Mahdi Ghorbani-Asl
- Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | | | - Ming-Deng Siao
- Department of Electrical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Po-Wen Chiu
- Department of Electrical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
| | - Hiroki Ago
- Global Innovation Center (GIC), Kyushu University, Fukuoka 816-8580, Japan
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka 816-8580, Japan
| | - Arkady V Krasheninnikov
- Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
- Department of Applied Physics, Aalto University, P.O. Box 11100, 00076 Aalto, Finland
| | - Kazu Suenaga
- The Institute of Scientific and Industrial Research (ISIR-SANKEN), Osaka University, Osaka 567-0047, Japan
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
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5
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Kim D, Pandey J, Jeong J, Cho W, Lee S, Cho S, Yang H. Phase Engineering of 2D Materials. Chem Rev 2023; 123:11230-11268. [PMID: 37589590 DOI: 10.1021/acs.chemrev.3c00132] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/18/2023]
Abstract
Polymorphic 2D materials allow structural and electronic phase engineering, which can be used to realize energy-efficient, cost-effective, and scalable device applications. The phase engineering covers not only conventional structural and metal-insulator transitions but also magnetic states, strongly correlated band structures, and topological phases in rich 2D materials. The methods used for the local phase engineering of 2D materials include various optical, geometrical, and chemical processes as well as traditional thermodynamic approaches. In this Review, we survey the precise manipulation of local phases and phase patterning of 2D materials, particularly with ideal and versatile phase interfaces for electronic and energy device applications. Polymorphic 2D materials and diverse quantum materials with their layered, vertical, and lateral geometries are discussed with an emphasis on the role and use of their phase interfaces. Various phase interfaces have demonstrated superior and unique performance in electronic and energy devices. The phase patterning leads to novel homo- and heterojunction structures of 2D materials with low-dimensional phase boundaries, which highlights their potential for technological breakthroughs in future electronic, quantum, and energy devices. Accordingly, we encourage researchers to investigate and exploit phase patterning in emerging 2D materials.
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Affiliation(s)
- Dohyun Kim
- Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Juhi Pandey
- Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Juyeong Jeong
- Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Woohyun Cho
- Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Seungyeon Lee
- Division of Chemical Engineering and Materials Science, Graduate Program in System Health Science and Engineering, Ewha Womans University, Seoul 03760, Korea
| | - Suyeon Cho
- Division of Chemical Engineering and Materials Science, Graduate Program in System Health Science and Engineering, Ewha Womans University, Seoul 03760, Korea
| | - Heejun Yang
- Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
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6
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Iyo A, Ogino H, Ishida S, Eisaki H. Dramatically Accelerated Formation of Graphite Intercalation Compounds Catalyzed by Sodium. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2209964. [PMID: 36661255 DOI: 10.1002/adma.202209964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 01/17/2023] [Indexed: 06/17/2023]
Abstract
Graphite intercalation compounds (GICs) have a variety of functions due to their rich material variations, and thus, innovative methods for their synthesis are desired for practical applications. It is discovered that Na has a catalytic property that dramatically accelerates the formation of GICs. It is demonstrated that LiC6 n (n = 1, 2), KC8 , KC12 n (n = 2, 3, 4), and NaCx are synthesized simply by mixing alkali metals and graphite powder with Na at room temperature (≈25 °C), and AE C6 (AE = Ca, Sr, Ba) are synthesized by heating Na-added reagents at 250 °C only for a few hours. The NaCx , formed by the mixing of C and Na, is understood to act as a reaction intermediate for a catalyst, thereby accelerating the formation of GICs by lowering the activation energy of intercalation. The Na-catalyzed method, which enables the rapid and mass synthesis of homogeneous GIC samples in a significantly simpler manner than conventional methods, is anticipated to stimulate research and development for GIC applications.
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Affiliation(s)
- Akira Iyo
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8568, Japan
| | - Hiraku Ogino
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8568, Japan
| | - Shigeyuki Ishida
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8568, Japan
| | - Hiroshi Eisaki
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8568, Japan
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7
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Er-Rahmany S, Loulidi M, El Kenz A, Benyoussef A, Balli M, Azzouz M. Prediction of superconductivity in Li, K, Ca, and Sr-intercalated blue phosphorene bilayer using first-principle calculations. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2023; 35:135601. [PMID: 36693282 DOI: 10.1088/1361-648x/acb5d9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Accepted: 01/24/2023] [Indexed: 06/17/2023]
Abstract
Blue phosphorene is an interesting two-dimensional (2D) material, which has attracted the attention of researchers, due to its affluent physical and chemical properties. In recent years, it was discovered that the intercalation of alkali metals and alkaline earth metals in 2D materials may lead to conventional Bardeen-Cooper-Schrieffer (BCS) superconductivity. In this work, the electronic structure, phonon dispersion, Eliashberg spectral function, electron-phonon coupling (EPC), and the critical temperature of blue phosphorene bilayer intercalated by alkali metals (Li, and K) and alkaline earth metals (Ca, and Sr) for both AB and AC stacking orders are studied using the density functional theory and the density functional perturbation theory, within the generalized gradient approximation with van der Waals correction. The present work shows that the blue phosphorene bilayer is dynamically stable in AB stacking for Li and AC stacking for K, Ca, and Sr, and after intercalation, it transforms from a semiconductor to a metal owing to charge transfer between intercalated atoms and phosphorene. Furthermore, the EPC constant and the critical temperature are higher than those of 2D BCS-type superconductors. They are about 3 and 24.61 K respectively for K-intercalated blue phosphorene bilayer. Thus, our results suggest that blue phosphorene is a good candidate for a superconductor.
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Affiliation(s)
- S Er-Rahmany
- Laboratory of Condensed Matter and Interdisciplinary Sciences, Unite de Recherche Labelliseìe CNRST, URL-CNRST-17, Faculty of Sciences, Mohammed V University of Rabat, Rabat, Morocco
- AMEEC Team, LERMA, College of Engineering and Architecture, International University of Rabat, Parc Technopolis, Rocade de Rabat-Salé, Sala El jadida11100, Morocco
| | - M Loulidi
- Laboratory of Condensed Matter and Interdisciplinary Sciences, Unite de Recherche Labelliseìe CNRST, URL-CNRST-17, Faculty of Sciences, Mohammed V University of Rabat, Rabat, Morocco
| | - A El Kenz
- Laboratory of Condensed Matter and Interdisciplinary Sciences, Unite de Recherche Labelliseìe CNRST, URL-CNRST-17, Faculty of Sciences, Mohammed V University of Rabat, Rabat, Morocco
| | - A Benyoussef
- Laboratory of Condensed Matter and Interdisciplinary Sciences, Unite de Recherche Labelliseìe CNRST, URL-CNRST-17, Faculty of Sciences, Mohammed V University of Rabat, Rabat, Morocco
- Hassan II Academy of Sciences and Techniques, Rabat, Morocco
| | - M Balli
- AMEEC Team, LERMA, College of Engineering and Architecture, International University of Rabat, Parc Technopolis, Rocade de Rabat-Salé, Sala El jadida11100, Morocco
| | - M Azzouz
- Al Akhawayn University, School of Science and Engineering, PO Box 104, Hassan II Avenue, 53000 Ifrane, Morocco
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8
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El Hajj I, Speyer L, Cahen S, Berger P, Medjahdi G, Lagrange P, Hérold C. Simultaneous intercalation of lithium, potassium and strontium into graphite in molten salts medium. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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9
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Xi Y, Jing X, Xu Z, Liu N, Liu Y, Lin ML, Yang M, Sun Y, Zhuang J, Xu X, Hao W, Li Y, Li X, Wei X, Tan PH, Li Q, Liu B, Dou SX, Du Y. Superconductivity in Layered van der Waals Hydrogenated Germanene at High Pressure. J Am Chem Soc 2022; 144:18887-18895. [PMID: 36194558 DOI: 10.1021/jacs.2c05683] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The emergence of superconductivity in two-dimensional (2D) materials has attracted tremendous research efforts because the origins and mechanisms behind the unexpected and fascinating superconducting phenomena remain unclear. In particular, the superconductivity can survive in 2D systems even with weakened disorder and broken spatial inversion symmetry. Here, structural and superconducting transitions of 2D van der Waals (vdW) hydrogenated germanene (GeH) are observed under compression and decompression processes. GeH possesses a superconducting transition with a critical temperature (Tc) of 5.41 K at 8.39 GPa. A crystalline to amorphous transition occurs at 16.80 GPa, while superconductivity remains. An abnormal increase of Tc up to 6.11 K was observed during the decompression process, while the GeH remained in the 2D amorphous phase. A combination study of in situ high-pressure synchrotron X-ray diffraction, in situ high-pressure Raman spectroscopy, transition electron microscopy, and density functional theory simulations suggests that the superconductivity in 2D vdW GeH is attributed to the increased density of states at the Fermi level as well as the enhanced electron-phonon coupling effect under high pressure even in the form of an amorphous phase. The unique pressure-induced phase transition of GeH from 2D crystalline to 2D amorphous metal hydride provides a promising platform to study the mechanisms of amorphous hydride superconductivity.
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Affiliation(s)
- Yilian Xi
- School of Physics, Beihang University, Beijing100191, China.,BUAA-UOW Joint Research Centre, Institute for Superconducting and Electronic Materials (ISEM), Australian Institute for Innovative Materials (AIIM), University of Wollongong, Wollongong, New South Wales2500, Australia.,Centre of Quantum and Matter Sciences, International Research Institute for Multidisciplinary Science, Beihang University, Beijing100191, China
| | - Xiaoling Jing
- State Key Laboratory of Superhard Materials, Jilin University, Changchun130012, China
| | - Zhongfei Xu
- School of Physics, Beihang University, Beijing100191, China.,BUAA-UOW Joint Research Centre, Institute for Superconducting and Electronic Materials (ISEM), Australian Institute for Innovative Materials (AIIM), University of Wollongong, Wollongong, New South Wales2500, Australia.,College of Environmental Science and Engineering, North China Electric Power University, Beijing102206, China
| | - Nana Liu
- School of Physics, Beihang University, Beijing100191, China.,BUAA-UOW Joint Research Centre, Institute for Superconducting and Electronic Materials (ISEM), Australian Institute for Innovative Materials (AIIM), University of Wollongong, Wollongong, New South Wales2500, Australia
| | - Yani Liu
- School of Physics, Beihang University, Beijing100191, China.,BUAA-UOW Joint Research Centre, Institute for Superconducting and Electronic Materials (ISEM), Australian Institute for Innovative Materials (AIIM), University of Wollongong, Wollongong, New South Wales2500, Australia
| | - Miao-Ling Lin
- State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing100083, China
| | - Ming Yang
- School of Physics, Beihang University, Beijing100191, China
| | - Ying Sun
- School of Physics, Beihang University, Beijing100191, China
| | - Jincheng Zhuang
- School of Physics, Beihang University, Beijing100191, China.,BUAA-UOW Joint Research Centre, Institute for Superconducting and Electronic Materials (ISEM), Australian Institute for Innovative Materials (AIIM), University of Wollongong, Wollongong, New South Wales2500, Australia
| | - Xun Xu
- School of Physics, Beihang University, Beijing100191, China.,BUAA-UOW Joint Research Centre, Institute for Superconducting and Electronic Materials (ISEM), Australian Institute for Innovative Materials (AIIM), University of Wollongong, Wollongong, New South Wales2500, Australia
| | - Weichang Hao
- School of Physics, Beihang University, Beijing100191, China.,BUAA-UOW Joint Research Centre, Institute for Superconducting and Electronic Materials (ISEM), Australian Institute for Innovative Materials (AIIM), University of Wollongong, Wollongong, New South Wales2500, Australia.,Centre of Quantum and Matter Sciences, International Research Institute for Multidisciplinary Science, Beihang University, Beijing100191, China
| | - Yanchun Li
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing100049, China
| | - Xiaodong Li
- Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing100049, China
| | - Xiangjun Wei
- Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai201204, China
| | - Ping-Heng Tan
- State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing100083, China
| | - Quanjun Li
- State Key Laboratory of Superhard Materials, Jilin University, Changchun130012, China
| | - Bingbing Liu
- State Key Laboratory of Superhard Materials, Jilin University, Changchun130012, China
| | - Shi Xue Dou
- School of Physics, Beihang University, Beijing100191, China.,BUAA-UOW Joint Research Centre, Institute for Superconducting and Electronic Materials (ISEM), Australian Institute for Innovative Materials (AIIM), University of Wollongong, Wollongong, New South Wales2500, Australia.,Centre of Quantum and Matter Sciences, International Research Institute for Multidisciplinary Science, Beihang University, Beijing100191, China
| | - Yi Du
- School of Physics, Beihang University, Beijing100191, China.,BUAA-UOW Joint Research Centre, Institute for Superconducting and Electronic Materials (ISEM), Australian Institute for Innovative Materials (AIIM), University of Wollongong, Wollongong, New South Wales2500, Australia.,Centre of Quantum and Matter Sciences, International Research Institute for Multidisciplinary Science, Beihang University, Beijing100191, China
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10
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Wang X, Liu N, Wu Y, Qu Y, Zhang W, Wang J, Guan D, Wang S, Zheng H, Li Y, Liu C, Jia J. Strong Coupling Superconductivity in Ca-Intercalated Bilayer Graphene on SiC. NANO LETTERS 2022; 22:7651-7658. [PMID: 36066512 DOI: 10.1021/acs.nanolett.2c02804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The metal-intercalated bilayer graphene has a flat band with a high density of states near the Fermi energy and thus is anticipated to exhibit an enhanced strong correlation effect and associated fascinating phenomena, including superconductivity. By using a self-developed multifunctional scanning tunneling microscope, we succeeded in observing the superconducting energy gap and diamagnetic response of a Ca-intercalated bilayer graphene below a critical temperature of 8.83 K. The revealed high value of gap ratio, 2Δ/kBTc ≈ 5.0, indicates a strong coupling superconductivity, while the variation of penetration depth with temperature and magnetic field indicates an isotropic s-wave superconductor. These results provide crucial experimental clues for understanding the origin and mechanism of superconductivity in carrier-doped graphene.
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Affiliation(s)
- Xutao Wang
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
| | - Ningning Liu
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
| | - Yanfu Wu
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
| | - Yueqiao Qu
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
| | - Wenxuan Zhang
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
| | - Jinyue Wang
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
| | - Dandan Guan
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, People's Republic of China
| | - Shiyong Wang
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, People's Republic of China
| | - Hao Zheng
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, People's Republic of China
| | - Yaoyi Li
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, People's Republic of China
| | - Canhua Liu
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, People's Republic of China
- Tsung-Dao Lee Institute, Shanghai 200240, People's Republic of China
| | - Jinfeng Jia
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, People's Republic of China
- Tsung-Dao Lee Institute, Shanghai 200240, People's Republic of China
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11
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Cost-Effective Calculation of Collective Electronic Excitations in Graphite Intercalated Compounds. NANOMATERIALS 2022; 12:nano12101746. [PMID: 35630968 PMCID: PMC9147427 DOI: 10.3390/nano12101746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 05/17/2022] [Accepted: 05/18/2022] [Indexed: 12/10/2022]
Abstract
Graphite/graphene intercalation compounds with good and improving electrical transport properties, optical properties, magnetic properties and even superconductivity are widely used in battery, capacitors and so on. Computational simulation helps with predicting important properties and exploring unknown functions, while it is restricted by limited computing resources and insufficient precision. Here, we present a cost-effective study on graphite/graphene intercalation compounds properties with sufficient precision. The calculation of electronic collective excitations in AA-stacking graphite based on the tight-binding model within the random phase approximation framework agrees quite well with previous experimental and calculation work, such as effects of doping level, interlayer distance, and interlayer hopping on 2D π plasmon and 3D intraband plasmon modes. This cost-effective simulation method can be extended to other intercalation compounds with unlimited intercalation species.
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12
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Lin YH, Hsu CH, Jang I, Chen CJ, Chiu PM, Lin DS, Wu CT, Chuang FC, Chang PY, Hsu PJ. Proximity-Effect-Induced Anisotropic Superconductivity in a Monolayer Ni-Pb Binary Alloy. ACS APPLIED MATERIALS & INTERFACES 2022; 14:23990-23997. [PMID: 35575457 DOI: 10.1021/acsami.2c03034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
A proximity effect facilitates the penetration of Cooper pairs that permits superconductivity in a normal metal, offering a promising approach to turn heterogeneous materials into superconductors and develop exceptional quantum phenomena. Here, we have systematically investigated proximity-induced anisotropic superconductivity in a monolayer Ni-Pb binary alloy by combining scanning tunneling microscopy/spectroscopy (STM/STS) with theoretical calculations. By means of high-temperature growth, the ( 3 3 × 3 3 ) R 30 o Ni-Pb surface alloy has been fabricated on Pb(111) and the appearance of a domain boundary as well as a structural phase transition can be deduced from a half-unit-cell lattice displacement. Given the high spatial and energy resolution, tunneling conductance (dI/dU) spectra have resolved the reduced but anisotropic superconducting gap ΔNiPb ≈ 1.0 meV, in stark contrast to the isotropic ΔPb ≈ 1.3 meV. In addition, the higher density of states at the Fermi energy (D(EF)) of the Ni-Pb surface alloy results in an enhancement of coherence peak height. According to the same Tc ≈ 7.1 K with Pb(111) from the temperature-dependent ΔNiPb and the short decay length Ld ≈ 3.55 nm from the spatially monotonic decrease of ΔNiPb, both results are supportive of a proximity-induced superconductivity. Despite a lack of a bulk counterpart, the atomically thick Ni-Pb bimetallic compound opens a pathway to engineer superconducting properties down to the two-dimensional limit, giving rise to the emergence of anisotropic superconductivity via a proximity effect.
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Affiliation(s)
- Yen-Hui Lin
- Department of Physics, National Tsing Hua University, Hsinchu 300044, Taiwan
| | - Chia-Hsiu Hsu
- Department of Physics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
- Physics Division, National Center for Theoretical Sciences, Taipei 10617, Taiwan
| | - Iksu Jang
- Department of Physics, National Tsing Hua University, Hsinchu 300044, Taiwan
| | - Chia-Ju Chen
- Department of Physics, National Tsing Hua University, Hsinchu 300044, Taiwan
| | - Pok-Man Chiu
- Department of Physics, National Tsing Hua University, Hsinchu 300044, Taiwan
| | - Deng-Sung Lin
- Department of Physics, National Tsing Hua University, Hsinchu 300044, Taiwan
- Center for Quantum Technology, National Tsing Hua University, Hsinchu 300044, Taiwan
| | - Chien-Te Wu
- Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu, 300093, Taiwan
| | - Feng-Chuan Chuang
- Department of Physics, National Tsing Hua University, Hsinchu 300044, Taiwan
- Department of Physics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
- Physics Division, National Center for Theoretical Sciences, Taipei 10617, Taiwan
| | - Po-Yao Chang
- Department of Physics, National Tsing Hua University, Hsinchu 300044, Taiwan
| | - Pin-Jui Hsu
- Department of Physics, National Tsing Hua University, Hsinchu 300044, Taiwan
- Center for Quantum Technology, National Tsing Hua University, Hsinchu 300044, Taiwan
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13
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Toyama H, Akiyama R, Ichinokura S, Hashizume M, Iimori T, Endo Y, Hobara R, Matsui T, Horii K, Sato S, Hirahara T, Komori F, Hasegawa S. Two-Dimensional Superconductivity of Ca-Intercalated Graphene on SiC: Vital Role of the Interface between Monolayer Graphene and the Substrate. ACS NANO 2022; 16:3582-3592. [PMID: 35209713 DOI: 10.1021/acsnano.1c11161] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Ca-intercalation has enabled superconductivity in graphene on SiC. However, the atomic and electronic structures that are critical for superconductivity are still under discussion. We find an essential role of the interface between monolayer graphene and the SiC substrate for superconductivity. In the Ca-intercalation process, at the interface a carbon layer terminating SiC changes to graphene by Ca-termination of SiC (monolayer graphene becomes a bilayer), inducing more electrons than a free-standing model. Then, Ca is intercalated in between the graphene layers, which shows superconductivity with the updated critical temperature (TC) of up to 5.7 K. In addition, the relation between TC and the normal-state conductivity is unusual, "dome-shaped". These findings are beyond the simple C6CaC6 model in which s-wave BCS superconductivity is theoretically predicted. This work proposes a general picture of the intercalation-induced superconductivity in graphene on SiC and indicates the potential for superconductivity induced by other intercalants.
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Affiliation(s)
- Haruko Toyama
- Department of Physics, The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
| | - Ryota Akiyama
- Department of Physics, The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
| | - Satoru Ichinokura
- Department of Physics, Tokyo Institution of Technology, Meguro, Tokyo 152-8551, Japan
| | - Mizuki Hashizume
- Department of Physics, Tokyo Institution of Technology, Meguro, Tokyo 152-8551, Japan
| | - Takushi Iimori
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Yukihiro Endo
- Department of Physics, The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
| | - Rei Hobara
- Department of Physics, The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
| | - Tomohiro Matsui
- Department of Physics, The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
| | - Kentaro Horii
- Department of Physics, Tokyo Institution of Technology, Meguro, Tokyo 152-8551, Japan
| | - Shunsuke Sato
- Department of Physics, The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
| | - Toru Hirahara
- Department of Physics, Tokyo Institution of Technology, Meguro, Tokyo 152-8551, Japan
| | - Fumio Komori
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Shuji Hasegawa
- Department of Physics, The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
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14
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Bai Z, He D, Fu S, Miao Q, Liu S, Huang M, Zhao K, Wang Y, Zhang X. Recent progress in electron–phonon interaction of two‐dimensional materials. NANO SELECT 2022. [DOI: 10.1002/nano.202100367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Affiliation(s)
- Zhiying Bai
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology Beijing Jiaotong University Beijing China
| | - Dawei He
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology Beijing Jiaotong University Beijing China
| | - Shaohua Fu
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology Beijing Jiaotong University Beijing China
| | - Qing Miao
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology Beijing Jiaotong University Beijing China
| | - Shuangyan Liu
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology Beijing Jiaotong University Beijing China
| | - Mohan Huang
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology Beijing Jiaotong University Beijing China
| | - Kun Zhao
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology Beijing Jiaotong University Beijing China
| | - Yongsheng Wang
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology Beijing Jiaotong University Beijing China
| | - Xiaoxian Zhang
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology Beijing Jiaotong University Beijing China
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15
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Lin YC, Motoyama A, Solís-Fernández P, Matsumoto R, Ago H, Suenaga K. Coupling and Decoupling of Bilayer Graphene Monitored by Electron Energy Loss Spectroscopy. NANO LETTERS 2021; 21:10386-10391. [PMID: 34881904 DOI: 10.1021/acs.nanolett.1c03689] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
We studied the interlayer coupling and decoupling of bilayer graphene (BLG) using spatially resolved electron energy loss spectroscopy with a monochromated electron source. We correlated the twist-angle-dependent energy band hybridization with Moiré superlattices and the corresponding optical absorption peaks. The optical absorption peak originates from the excitonic transition between the hybridized van Hove singularities (vHSs), which shifts systematically with the twist angle. We then proved that the BLG decouples when a monolayer of metal chloride is intercalated in its van der Waals gap and results in the elimination of the vHS peak.
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Affiliation(s)
- Yung-Chang Lin
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
| | - Amane Motoyama
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka, Fukuoka 816-8580, Japan
| | | | - Rika Matsumoto
- Faculty of Engineering, Tokyo Polytechnic University 1583 Iiyama, Atsugi, Kanagawa 243-0297, Japan
| | - Hiroki Ago
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka, Fukuoka 816-8580, Japan
- Global Innovation Center (GIC), Kyushu University, Fukuoka, Fukuoka 816-8580, Japan
| | - Kazu Suenaga
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
- The Institute of Scientific and Industrial Research (ISIR-SANKEN), Osaka University, Osaka, Osaka 567-0047, Japan
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16
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Lin YC, Motoyama A, Kretschmer S, Ghaderzadeh S, Ghorbani-Asl M, Araki Y, Krasheninnikov AV, Ago H, Suenaga K. Polymorphic Phases of Metal Chlorides in the Confined 2D Space of Bilayer Graphene. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2105898. [PMID: 34610179 DOI: 10.1002/adma.202105898] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 09/28/2021] [Indexed: 06/13/2023]
Abstract
Unprecedented 2D metal chloride structures are grown between sheets of bilayer graphene through intercalation of metal and chlorine atoms. Numerous spatially confined 2D phases of AlCl3 and CuCl2 distinct from their typical bulk forms are found, and the transformations between these new phases under the electron beam are directly observed by in situ scanning transmission electron microscopy (STEM). The density functional theory calculations confirm the metastability of the atomic structures derived from the STEM experiments and provide insights into the electronic properties of the phases, which range from insulators to semimetals. Additionally, the co-intercalation of different metal chlorides is found to create completely new hybrid systems; in-plane quasi-1D AlCl3 /CuCl2 heterostructures are obtained. The existence of polymorphic phases hints at the unique possibilities for fabricating new types of 2D materials with diverse electronic properties confined between graphene sheets.
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Affiliation(s)
- Yung-Chang Lin
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8565, Japan
| | - Amane Motoyama
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka, 816-8580, Japan
| | - Silvan Kretschmer
- Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - Sadegh Ghaderzadeh
- Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - Mahdi Ghorbani-Asl
- Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - Yuji Araki
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka, 816-8580, Japan
| | - Arkady V Krasheninnikov
- Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
- Department of Applied Physics, Aalto University, P.O. Box 11100, Aalto, 00076, Finland
| | - Hiroki Ago
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka, 816-8580, Japan
- Global Innovation Center (GIC), Kyushu University, Fukuoka, 816-8580, Japan
| | - Kazu Suenaga
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8565, Japan
- The Institute of Scientific and Industrial Research (ISIR-SANKEN), Osaka University, Osaka, 567-0047, Japan
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17
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Yang Q, Zhao K, Liu H, Zhang S. Superconductive Sodium Carbides with Pentagon Carbon at High Pressures. J Phys Chem Lett 2021; 12:5850-5856. [PMID: 34138569 DOI: 10.1021/acs.jpclett.1c01096] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The design of metal-bearing carbon-based materials with unique structures and intriguing properties is highly desirable in the fields of physics, chemistry, and materials science. Here, within swarm-intelligence structure search and first-principles computations, we uncovered several hitherto unknown sodium carbides (i.e., Na4C, Na3C2, NaC, Na2C3, and NaC2) under high pressure. Intriguingly, the C atom arrangement reveals multiple structure evolution behavior with increased carbon content, from isolated anions in Na4C, tetramers in Na3C2, extended chains in NaC, pentagonal rings in Na2C3, to eventually hexagonal rings in NaC2. Among predicted phases, the superconducting critical temperature Tc of NaC2 could approach ∼42 K at 80 GPa, which is slightly higher than the Tc of 39 K in the highest phonon-mediated superconductivity of MgB2 at ambient pressure. This work offers insights into the reaction of carbides containing alkali metals and paves the way for the future investigation of high superconductivity in metal carbide systems.
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Affiliation(s)
- Qiuping Yang
- Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun 130024, China
| | - Kaixuan Zhao
- Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun 130024, China
| | - Hanyu Liu
- International Center for Computational Method & Software and State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun 130012, China
| | - Shoutao Zhang
- Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun 130024, China
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18
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Abstract
The development of potential magnetic materials in metal-doped polycyclic aromatic hydrocarbons has been a research hotspot in recent years. Here we have successfully synthesized stable potassium-doped 2,3-dimethylnaphthalene samples. The combination of first-principles calculations and XRD results identifies that doping of potassium into 2,3-dimethylnaphthalene forms a monoclinic structure with a molar ratio of 1:2 between potassium and molecule. The red shifts in the Raman spectra indicate that potassium 4s electrons are transferred to the organic molecules. The magnetic measurements show that the doped materials exhibit a temperature-independent magnetization in the temperature region of 1.8–300 K, which is consistent with the Pauli paramagnetic behavior. This is distinct from the diamagnetism of pristine material. Compared to the previous focus on benzene ring structure, our study of aromatic hydrocarbon derivatives of benzene ring opens a new route for the development of this field.
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19
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Begunovich LV, Kuklin AV, Baryshnikov GV, Valiev RR, Ågren H. Single-layer polymeric tetraoxa[8]circulene modified by s-block metals: toward stable spin qubits and novel superconductors. NANOSCALE 2021; 13:4799-4811. [PMID: 33629695 DOI: 10.1039/d0nr08554e] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Tunable electronic properties of low-dimensional materials have been the object of extensive research, as such properties are highly desirable in order to provide flexibility in the design and optimization of functional devices. In this study, we account for the fact that such properties can be tuned by embedding diverse metal atoms and theoretically study a series of new organometallic porous sheets based on two-dimensional tetraoxa[8]circulene (TOC) polymers doped with alkali or alkaline-earth metals. The results reveal that the metal-decorated sheets change their electronic structure from semiconducting to metallic behaviour due to n-doping. Complete active space self-consistent field (CASSCF) calculations reveal a unique open-shell singlet ground state in the TOC-Ca complex, which is formed by two closed-shell species. Moreover, Ca becomes a doublet state, which is promising for magnetic quantum bit applications due to the long spin coherence time. Ca-doped TOC also demonstrates a high density of states in the vicinity of the Fermi level and induced superconductivity. Using the ab initio Eliashberg formalism, we find that the TOC-Ca polymers are phonon-mediated superconductors with a critical temperature TC = 14.5 K, which is within the range of typical carbon based superconducting materials. Therefore, combining the proved superconductivity and the long spin lifetime in doublet Ca, such materials could be an ideal platform for the realization of quantum bits.
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Affiliation(s)
- Lyudmila V Begunovich
- International Research Center of Spectroscopy and Quantum Chemistry (IRC SQC), Siberian Federal University, 26 Kirensky st., 660074, Krasnoyarsk, Russia.
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20
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Gao L, Zhong GH, Lin HQ. Structures, electronic properties, and superconductivities of alkaline-earth metal-doped phenanthrene and charge transfer characteristics of metal-doped phenanthrene. Phys Chem Chem Phys 2020; 22:23847-23855. [PMID: 33073276 DOI: 10.1039/d0cp04020g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
To find potential alkaline-earth metal-doped aromatic superconductors and clarify the origin of superconductivity in metal-doped phenanthrene (PHN) systems, we have systematically investigated the crystal and electronic structures of bivalent metal (Mg, Ca, Sr and Ba)-doped PHNs by first-principles calculations. The results show that only Ba1.5PHN can satisfy the conditions of both thermodynamic stability and metallization. We predicted that Ba1.5PHN is superconducting with the critical temperature of 5.3 K. Based on the metal atomic radius and electronegativity and combined with monovalent metal- and trivalent metal-doped PHNs, the relations among charge transfer, metallization, and superconductivity were analyzed. The results indicate that the electronegativity of the metal element rather than the atomic radius is predominant in the charge transfer and superconductivity of metal-doped phenanthrene.
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Affiliation(s)
- Lei Gao
- Beijing Computational Science Research Center, Beijing, 100193, China.
| | - Guo-Hua Zhong
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China. and University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hai-Qing Lin
- Beijing Computational Science Research Center, Beijing, 100193, China.
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21
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Márkus BG, Szirmai P, Edelthalhammer KF, Eckerlein P, Hirsch A, Hauke F, Nemes NM, Chacón-Torres JC, Náfrádi B, Forró L, Pichler T, Simon F. Ultralong Spin Lifetime in Light Alkali Atom Doped Graphene. ACS NANO 2020; 14:7492-7501. [PMID: 32484657 PMCID: PMC7315639 DOI: 10.1021/acsnano.0c03191] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Today's great challenges of energy and informational technologies are addressed with a singular compound, Li- and Na-doped few-layer graphene. All that is impossible for graphite (homogeneous and high-level Na doping) and unstable for single-layer graphene works very well for this structure. The transformation of the Raman G line to a Fano line shape and the emergence of strong, metallic-like electron spin resonance (ESR) modes attest the high level of graphene doping in liquid ammonia for both kinds of alkali atoms. The spin-relaxation time in our materials, deduced from the ESR line width, is 6-8 ns, which is comparable to the longest values found in spin-transport experiments on ultrahigh-mobility graphene flakes. This could qualify our material as a promising candidate in spintronics devices. On the other hand, the successful sodium doping, this being a highly abundant metal, could be an encouraging alternative to lithium batteries.
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Affiliation(s)
- B. G. Márkus
- Department
of Physics, Budapest University of Technology
and Economics and MTA-BME Lendület Spintronics Research Group
(PROSPIN), PO Box 91, H-1521 Budapest, Hungary
- Laboratory
of Physics of Complex Matter, École
Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
| | - P. Szirmai
- Laboratory
of Physics of Complex Matter, École
Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
| | - K. F. Edelthalhammer
- Department
of Chemistry and Pharmacy and Institute of Advanced Materials and
Processes (ZMP), University of Erlangen-Nürnberg, Nikolaus-Fiebiger-Strasse 10, 91058 Erlangen, Germany
| | - P. Eckerlein
- Department
of Chemistry and Pharmacy and Institute of Advanced Materials and
Processes (ZMP), University of Erlangen-Nürnberg, Nikolaus-Fiebiger-Strasse 10, 91058 Erlangen, Germany
| | - A. Hirsch
- Department
of Chemistry and Pharmacy and Institute of Advanced Materials and
Processes (ZMP), University of Erlangen-Nürnberg, Nikolaus-Fiebiger-Strasse 10, 91058 Erlangen, Germany
| | - F. Hauke
- Department
of Chemistry and Pharmacy and Institute of Advanced Materials and
Processes (ZMP), University of Erlangen-Nürnberg, Nikolaus-Fiebiger-Strasse 10, 91058 Erlangen, Germany
| | - N. M. Nemes
- GFMC,
Unidad Asociada ICMM-CSIC “Laboratorio de Heteroestructuras
con Aplicacion en Espintronica”, Departamento de Fisica de Materiales Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Julio C. Chacón-Torres
- Yachay
Tech University, School of Physical Sciences and Nanotechnology, 100119,
Urcuquí, Ecuador and Universidad UTE, Facultad de Ciencias,
Ingeniería y Construcción, 170147 Quito, Ecuador
| | - B. Náfrádi
- Laboratory
of Physics of Complex Matter, École
Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
| | - L. Forró
- Laboratory
of Physics of Complex Matter, École
Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
| | - T. Pichler
- Faculty
of Physics, University of Vienna, Strudlhofgasse 4, Vienna, A-1090, Austria
| | - F. Simon
- Department
of Physics, Budapest University of Technology
and Economics and MTA-BME Lendület Spintronics Research Group
(PROSPIN), PO Box 91, H-1521 Budapest, Hungary
- Laboratory
of Physics of Complex Matter, École
Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland
- E-mail:
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22
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Hao CM, Li Y, Huang HM, Li Y, Li YL. Pressure-Induced Structural Phase Transition and Superconductivity in NaSn 5. Inorg Chem 2020; 59:484-490. [PMID: 31829575 DOI: 10.1021/acs.inorgchem.9b02746] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The structural and electronic properties of the tin-rich compound NaSn5 were investigated under pressures of up to 10 GPa on the basis of the evolutionary algorithm (EA) technique coupled with first-principles total energy calculations. Upon compression, the known metallic tetragonal P4̅21m phase transforms into a metallic hexagonal P6/mmm phase at 1.85 GPa accompanied by an unusual change in the existing form of Sn atoms. The P6/mmm phase can be interpreted as a quasi-layered sandwich structure with two Sn layers and one sodium layer. The presence of softening phonon modes and the existence of Fermi pockets together with the obvious Fermi surface nesting indicate a strong electron-phonon coupling (EPC) and thus potential superconductivity in the P6/mmm phase. The strong EPC in the P6/mmm phase is mainly attributed to the phonons from Sn1 atoms together with electrons from the Sn1 py and Sn1 pz states. The calculated superconducting critical temperature Tc of the P6/mmm phase is 5.91 K at 1.85 GPa. This study provides a new clue for designing intercalated compounds with superconductivity.
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Affiliation(s)
- Chun-Mei Hao
- School of Physics and Electronic Engineering , Jiangsu Normal University , Xuzhou 221116 , People's Republic of China
| | - Yunguo Li
- School of Physics and Electronic Engineering , Jiangsu Normal University , Xuzhou 221116 , People's Republic of China.,Department of Earth Sciences , University College London , Gower Street , London WC1E 6BT , U.K
| | - Hong-Mei Huang
- School of Physics and Electronic Engineering , Jiangsu Normal University , Xuzhou 221116 , People's Republic of China
| | - Yinwei Li
- School of Physics and Electronic Engineering , Jiangsu Normal University , Xuzhou 221116 , People's Republic of China
| | - Yan-Ling Li
- School of Physics and Electronic Engineering , Jiangsu Normal University , Xuzhou 221116 , People's Republic of China
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23
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Cahen S, El-Hajj I, Speyer L, Berger P, Medjahdi G, Lagrange P, Lamura G, Hérold C. Original synthesis route of bulk binary superconducting graphite intercalation compounds with strontium, barium and ytterbium. NEW J CHEM 2020. [DOI: 10.1039/c9nj06423k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis route in molten salts allows the bulk intercalation into graphite of elements hardly intercalated by themselves. XRD and ion beam analyses show for instance the possible synthesis of SrC6.
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Affiliation(s)
- S. Cahen
- Institut Jean Lamour
- UMR 7198 CNRS-UL
- 54011 Nancy Cedex
- France
| | - I. El-Hajj
- Institut Jean Lamour
- UMR 7198 CNRS-UL
- 54011 Nancy Cedex
- France
| | - L. Speyer
- Institut Jean Lamour
- UMR 7198 CNRS-UL
- 54011 Nancy Cedex
- France
| | - P. Berger
- NIMBE
- CEA
- CNRS
- Université Paris-Saclay
- Gif sur Yvette Cedex
| | - G. Medjahdi
- Institut Jean Lamour
- UMR 7198 CNRS-UL
- 54011 Nancy Cedex
- France
| | - P. Lagrange
- Institut Jean Lamour
- UMR 7198 CNRS-UL
- 54011 Nancy Cedex
- France
| | | | - C. Hérold
- Institut Jean Lamour
- UMR 7198 CNRS-UL
- 54011 Nancy Cedex
- France
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24
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Park J, Xu ZL, Yoon G, Park SK, Wang J, Hyun H, Park H, Lim J, Ko YJ, Yun YS, Kang K. Stable and High-Power Calcium-Ion Batteries Enabled by Calcium Intercalation into Graphite. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1904411. [PMID: 31736158 DOI: 10.1002/adma.201904411] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Revised: 10/17/2019] [Indexed: 06/10/2023]
Abstract
Calcium-ion batteries (CIBs) are considered to be promising next-generation energy storage systems because of the natural abundance of calcium and the multivalent calcium ions with low redox potential close to that of lithium. However, the practical realization of high-energy and high-power CIBs is elusive owing to the lack of suitable electrodes and the sluggish diffusion of calcium ions in most intercalation hosts. Herein, it is demonstrated that calcium-ion intercalation can be remarkably fast and reversible in natural graphite, constituting the first step toward the realization of high-power calcium electrodes. It is shown that a graphite electrode exhibits an exceptionally high rate capability up to 2 A g-1 , delivering ≈75% of the specific capacity at 50 mA g-1 with full calcium intercalation in graphite corresponding to ≈97 mAh g-1 . Moreover, the capacity stably maintains over 200 cycles without notable cycle degradation. It is found that the calcium ions are intercalated into graphite galleries with a staging process. The intercalation mechanisms of the "calciated" graphite are elucidated using a suite of techniques including synchrotron in situ X-ray diffraction, nuclear magnetic resonance, and first-principles calculations. The versatile intercalation chemistry of graphite observed here is expected to spur the development of high-power CIBs.
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Affiliation(s)
- Jooha Park
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak-ro Gwanak-gu, Seoul, 151-742, Republic of Korea
| | - Zheng-Long Xu
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak-ro Gwanak-gu, Seoul, 151-742, Republic of Korea
| | - Gabin Yoon
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak-ro Gwanak-gu, Seoul, 151-742, Republic of Korea
| | - Sung Kwan Park
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak-ro Gwanak-gu, Seoul, 151-742, Republic of Korea
| | - Jian Wang
- Department of Chemistry, Seoul National University, 1 Gwanak-ro Gwanak-gu, Seoul, 151-742, Republic of Korea
| | - Hyejeong Hyun
- Department of Chemistry, Seoul National University, 1 Gwanak-ro Gwanak-gu, Seoul, 151-742, Republic of Korea
| | - Hyeokjun Park
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak-ro Gwanak-gu, Seoul, 151-742, Republic of Korea
| | - Jongwoo Lim
- Department of Chemistry, Seoul National University, 1 Gwanak-ro Gwanak-gu, Seoul, 151-742, Republic of Korea
| | - Yoon-Joo Ko
- Lab of Nuclear Magnetic Resonance, National Center for Inter-University Research Facilities, Seoul National University, Seoul, 08826, Republic of Korea
| | - Young Soo Yun
- KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 02841, Republic of Korea
| | - Kisuk Kang
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak-ro Gwanak-gu, Seoul, 151-742, Republic of Korea
- Institute of Engineering Research, College of Engineering, Seoul National University, 1 Gwanak-ro Gwanak-gu, Seoul, 151-742, Republic of Korea
- Center for Nanoparticle Research, Institute of Basic Science, Seoul National University, 1 Gwanak-ro Gwanak-gu, Seoul, 151-742, Republic of Korea
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25
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Kim S, Kim K, Koo J, Lee H, Il Min B, Kim DY. Pressure-induced phase transitions and superconductivity in magnesium carbides. Sci Rep 2019; 9:20253. [PMID: 31882982 PMCID: PMC6934831 DOI: 10.1038/s41598-019-56497-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Accepted: 12/12/2019] [Indexed: 11/16/2022] Open
Abstract
Crystal structure prediction and in silico physical property observations guide experimental synthesis in high-pressure research. Here, we used magnesium carbides as a representative example of computational high-pressure studies. We predicted various compositions of Mg–C compounds up to 150 GPa and successfully reproduced previous experimental results. Interestingly, our proposed MgC2 at high pressure >7 GPa consists of extended carbon bonds, one-dimensional graphene layers, and Mg atomic layers, which provides a good platform to study superconductivity of metal intercalated graphene nano-ribbons. We found that this new phase of MgC2 could be recovered to ambient pressure and exhibited a strong electron-phonon coupling (EPC) strength of 0.6 whose corresponding superconductivity transition temperature reached 15 K. The EPC originated from the cooperation of the out-of-plane and the in-plane phonon modes. The geometry confinement and the hybridization between the Mg s and C pz orbitals significantly affect the coupling of phonon modes and electrons. These results show the importance of the high-pressure route to the synthesis of novel functional materials, which can promote the search for new phases of carbon-based superconductors.
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Affiliation(s)
- Sooran Kim
- Department of Physics, Pohang University of Science and Technology, Pohang, 37673, South Korea.,Department of Physics Education, Kyungpook National University, Daegu, 41566, Korea
| | - Kyoo Kim
- Department of Physics, Pohang University of Science and Technology, Pohang, 37673, South Korea.,Max Plank-POSTECH/Hsinchu Center for Complex Phase Materials, Pohang University of Science and Technology, Pohang, 37673, South Korea.,Korea Atomic Energy Research Institute (KAERI), 111 Daedeok-daero 989 Beon-Gil, Yuseong-gu, Daejeon, 34057, South Korea
| | - Jahyun Koo
- Department of Physics, Konkuk University, Seoul, 05029, South Korea
| | - Hoonkyung Lee
- Department of Physics, Konkuk University, Seoul, 05029, South Korea
| | - Byung Il Min
- Department of Physics, Pohang University of Science and Technology, Pohang, 37673, South Korea
| | - Duck Young Kim
- Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China. .,Department of Chemistry, Pohang University of Science and Technology, Pohang, 37673, South Korea.
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26
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Cahen S, Speyer L, Lagrange P, Hérold C. Topotactic Mechanisms Related to the Graphene Planes: Chemical Intercalation of Electron Donors into Graphite. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900758] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Sébastien Cahen
- Carbon‐Based Materials Group Campus ARTEM ‐ 2 Allée André Guinier, B.P. 50840 54011 Nancy Cedex France
| | - Lucie Speyer
- Carbon‐Based Materials Group Campus ARTEM ‐ 2 Allée André Guinier, B.P. 50840 54011 Nancy Cedex France
| | - Philippe Lagrange
- Carbon‐Based Materials Group Campus ARTEM ‐ 2 Allée André Guinier, B.P. 50840 54011 Nancy Cedex France
| | - Claire Hérold
- Carbon‐Based Materials Group Campus ARTEM ‐ 2 Allée André Guinier, B.P. 50840 54011 Nancy Cedex France
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27
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Ninomiya H, Oka K, Hase I, Kawashima K, Fujihisa H, Gotoh Y, Ishida S, Ogino H, Iyo A, Yoshida Y, Eisaki H. Superconductivity in a Scandium Borocarbide with a Layered Crystal Structure. Inorg Chem 2019; 58:15629-15636. [PMID: 31661255 DOI: 10.1021/acs.inorgchem.9b02709] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The discovery of nearly room-temperature superconductivity in superhydrides has motivated further materials research for conventional superconductors. To realize the moderately high critical temperature (Tc) in materials containing light elements, we explored new superconducting phases in a scandium borocarbide system. Here, we report the observation of superconductivity in a new ternary Sc-B-C compound. The crystal structure, which was determined through a Rietveld analysis, belongs to tetragonal space group P4/ncc. By complementarily using the density functional theory calculations, a chemical formula of the compound was found to be expressed as Sc20C8-xBxC20 (x = 1 or 2). Interestingly, a small amount of B is essential to stabilize the present structure. Our experiments revealed the typical type-II superconductivity at Tc = 7.7 K. Additionally, we calculated the density of states within a first-principles approach and found that the contribution of the Sc-3d orbital was mainly responsible for the superconductivity.
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Affiliation(s)
- Hiroki Ninomiya
- National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba , Ibaraki 305-8568 , Japan
| | - Kunihiko Oka
- National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba , Ibaraki 305-8568 , Japan
| | - Izumi Hase
- National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba , Ibaraki 305-8568 , Japan
| | - Kenji Kawashima
- National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba , Ibaraki 305-8568 , Japan.,IMRA Material R&D Co., Ltd. , Kariya , Aichi 448-0032 , Japan
| | - Hiroshi Fujihisa
- National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba , Ibaraki 305-8568 , Japan
| | - Yoshito Gotoh
- National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba , Ibaraki 305-8568 , Japan
| | - Shigeyuki Ishida
- National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba , Ibaraki 305-8568 , Japan
| | - Hiraku Ogino
- National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba , Ibaraki 305-8568 , Japan
| | - Akira Iyo
- National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba , Ibaraki 305-8568 , Japan
| | - Yoshiyuki Yoshida
- National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba , Ibaraki 305-8568 , Japan
| | - Hiroshi Eisaki
- National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba , Ibaraki 305-8568 , Japan
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28
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Ishikawa H, Wedig U, Nuss J, Kremer RK, Dinnebier R, Blankenhorn M, Pakdaman M, Matsumoto Y, Takayama T, Kitagawa K, Takagi H. Superconductivity at 4.8 K and Violation of Pauli Limit in La 2IRu 2 Comprising Ru Honeycomb Layer. Inorg Chem 2019; 58:12888-12894. [PMID: 31518128 DOI: 10.1021/acs.inorgchem.9b01825] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We discovered superconductivity at 4.8 K in the hexagonal layered compound La2IRu2 comprising a triangular lattice of the La and a honeycomb lattice of the Ru atoms. First-principles calculations reveal a two-dimensional band structure made up of La 5d and Ru 4d electrons and formal oxidation states +1.5 for the La and the uncommon oxidation state -1 for the Ru atoms. The temperature dependence of the specific heat indicates fully gapped superconductivity. Nevertheless, the upper critical field of this compound violates the Pauli limit. We argue that the high upper critical field is ascribed to an antisymmetric spin-orbit coupling in the unique multilayer structure.
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Affiliation(s)
- Hajime Ishikawa
- Institute for Functional Matter and Quantum Technologies , Universität Stuttgart , 70569 Stuttgart , Germany.,Max Planck Institute for Solid State Research , Heisenbergstraße 1 , 70569 Stuttgart , Germany
| | - Ulrich Wedig
- Max Planck Institute for Solid State Research , Heisenbergstraße 1 , 70569 Stuttgart , Germany
| | - Jürgen Nuss
- Max Planck Institute for Solid State Research , Heisenbergstraße 1 , 70569 Stuttgart , Germany
| | - Reinhard K Kremer
- Max Planck Institute for Solid State Research , Heisenbergstraße 1 , 70569 Stuttgart , Germany
| | - Robert Dinnebier
- Max Planck Institute for Solid State Research , Heisenbergstraße 1 , 70569 Stuttgart , Germany
| | - Marian Blankenhorn
- Institute for Functional Matter and Quantum Technologies , Universität Stuttgart , 70569 Stuttgart , Germany
| | - Mohammad Pakdaman
- Max Planck Institute for Solid State Research , Heisenbergstraße 1 , 70569 Stuttgart , Germany
| | - Yosuke Matsumoto
- Max Planck Institute for Solid State Research , Heisenbergstraße 1 , 70569 Stuttgart , Germany
| | - Tomohiro Takayama
- Institute for Functional Matter and Quantum Technologies , Universität Stuttgart , 70569 Stuttgart , Germany.,Max Planck Institute for Solid State Research , Heisenbergstraße 1 , 70569 Stuttgart , Germany
| | - Kentaro Kitagawa
- Department of Physics , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku, Tokyo 113-0033 , Japan
| | - Hidenori Takagi
- Institute for Functional Matter and Quantum Technologies , Universität Stuttgart , 70569 Stuttgart , Germany.,Max Planck Institute for Solid State Research , Heisenbergstraße 1 , 70569 Stuttgart , Germany.,Department of Physics , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku, Tokyo 113-0033 , Japan
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29
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Meng LB, Zhou MJ, Zhang YJ, Ni S. Intrinsic phonon-mediated superconductivity in graphene-like BSi lattice. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:345401. [PMID: 31096196 DOI: 10.1088/1361-648x/ab21eb] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The research of new superconductors is an ongoing field for the fundamental significances and potential applications, and two-dimensional (2D) nanomaterials open a new alluring branch for exploration. Here we predict by first-principles calculations that 2D pristine graphene-like BSi monolayer is a phonon-mediated superconductor above the boiling point of liquid helium. The intrinsic covalent-metallic ground state, large density of states at Fermi energy, proper electronic organization as well as strong coupling of out-of-plane phonons and electrons endow an intermediate electron-phonon coupling of ~1.12, rendering this honeycomb sheet as a conventional superconductor with a relatively high T c ~ 11 K. As the global minimum structure in the 2D space previously predicted, this superconducting BSi monolayer may be feasible experimentally. Our finding provides a new field of superconducting nanomaterials for study.
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Affiliation(s)
- L-B Meng
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, People's Republic of China
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30
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Haque E, Hossain MA, Stampfl C. First-principles prediction of phonon-mediated superconductivity in XBC (X = Mg, Ca, Sr, Ba). Phys Chem Chem Phys 2019; 21:8767-8773. [PMID: 30968874 DOI: 10.1039/c8cp07634k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
From first-principles calculations, we predict four new intercalated hexagonal XBC (X = Mg, Ca, Sr, Ba) compounds to be dynamically stable and phonon-mediated superconductors. These compounds form a LiBC like structure but are metallic. The calculated superconducting critical temperature, Tc, of MgBC is 51 K. The strong attractive interaction between σ-bonding electrons and the B1g phonon mode gives rise to a larger electron-phonon coupling constant (1.135) and hence high Tc; notably, higher than that of MgB2. The other compounds have a low superconducting critical temperature (4-17 K) due to the interaction between σ-bonding electrons and low energy phonons (E2u modes). Due to their energetic and dynamic stability, we envisage that these compounds can be synthesized experimentally.
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Affiliation(s)
- Enamul Haque
- Department of Physics, Mawlana Bhashani Science and Technology University Santosh, Tangail-1902, Bangladesh
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31
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Durajski AP, Skoczylas KM, Szcze Combining Cedilla Śniak R. Superconductivity in bilayer graphene intercalated with alkali and alkaline earth metals. Phys Chem Chem Phys 2019; 21:5925-5931. [PMID: 30785457 DOI: 10.1039/c9cp00176j] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
With the enormous research activity focused on graphene in recent years, it is not surprising that graphene superconductivity has become an attractive area of research. To date, no superconducting properties have been experimentally observed in the pristine form of graphene but controllable structure manipulation is a promising way to induce a superconducting state in graphene-based systems. Therefore, herein we investigate the possible superconductivity in two-layer graphene intercalated with atoms of alkali and alkaline earth metals. Results of our calculations conducted within the framework of density functional theory combined with the Eliashberg theory allow us to conclude that the Cooper pairing in these superconductors can be described in a standard phonon-mediated scenario. In this regime, C6XC6 (X = K, Ca, Rb and Sr) are expected to be superconductors with estimated superconducting critical temperatures of 5.47-14.56 K and with the ratios of energy gap to transition temperature exceeding the value predicted by the Bardeen-Cooper-Schrieffer theory.
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Affiliation(s)
- Artur P Durajski
- Institute of Physics, Cze[combining cedilla]stochowa University of Technology, Ave. Armii Krajowej 19, 42-200 Cze[combining cedilla]stochowa, Poland.
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32
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Zhang CF, Huang ZB, Yan XW, Lin HQ. Charge transfer effect on Raman shifts of aromatic hydrocarbons with three phenyl rings from ab initio study. J Chem Phys 2019; 150:074306. [PMID: 30795678 DOI: 10.1063/1.5082792] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
To clarify the charge transfer effect on Raman spectra of aromatic hydrocarbons, we investigate the Raman shifts of phenanthrene, p-terphenyl, and anthracene and their negatively charged counterparts by using density functional theory. For the three molecules, upon charge increasing, the computed Raman peaks generally shift down with the exception of a few shifting up. The characteristic Raman modes in the 0-1000 cm-1 region persist up, while some high-frequency ones change dramatically with three charges transferred. The calculated Raman shifts for one- and two-electron transfer are in agreement with the measured Raman spectra, and in accordance to the stoichiometric ratios 1:1 and 2:1 of the metal atom and aromatic hydrocarbon molecule in recent experimental and theoretical studies. Our theoretical results provide the fundamental information to elucidate the Raman shifts and the stoichiometric ratios for alkali-metal-doped aromatic hydrocarbons.
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Affiliation(s)
- Chun-Fang Zhang
- College of Chemistry and Environmental Science, Hebei University, Baoding, Hebei 071002, China
| | - Zhong-Bing Huang
- Beijing Computational Science Research Center, Beijing 100193, China
| | - Xun-Wang Yan
- College of Physics and Engineering, Qufu Normal University, Qufu, Shandong 273165, China
| | - Hai-Qing Lin
- Beijing Computational Science Research Center, Beijing 100193, China
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33
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Ge Y, Ma S, Bao K, Tao Q, Zhao X, Feng X, Li L, Liu B, Zhu P, Cui T. Superconductivity with high hardness in Mo 3C 2. Inorg Chem Front 2019. [DOI: 10.1039/c9qi00182d] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
This work synthesized a high hardness and superconductive polycrystalline Mo3C2 material by the HPHT method. Mo3C2 exhibits superconductivity below 8.2 K and its hardness is far higher than that of the traditionally used superconductive materials.
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34
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Wang RS, Cheng J, Wu XL, Yang H, Chen XJ, Gao Y, Huang ZB. Superconductivity at 3.5 K and/or 7.2 K in potassium-doped triphenylbismuth. J Chem Phys 2018; 149:144502. [PMID: 30316270 DOI: 10.1063/1.5045631] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
We develop a two-step synthesis method-ultrasound treatment and low temperature annealing to explore superconductivity in potassium-doped triphenylbismuth, which is composed of one bismuth atom and three phenyl rings. The combination of dc and ac magnetic measurements reveals that one hundred percent of synthesized samples exhibit superconductivity at 3.5 K and/or 7.2 K at ambient pressure. The magnetization hysteresis loops provide a strong piece of evidence of type-II superconductors. It is found that the doped materials crystallize into the triclinic P1 structure, with a mole ratio of 4:1 between potassium and triphenylbismuth. Both the calculated electronic structure and measured Raman spectra indicate that superconductivity is realized by transferring electrons from the K-4s to C-2p orbital. Our study opens an encouraging window for the search of organic superconductors in organometallic molecules.
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Affiliation(s)
- Ren-Shu Wang
- School of Materials Science and Engineering, Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062, China
| | - Jia Cheng
- School of Materials Science and Engineering, Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062, China
| | - Xiao-Lin Wu
- School of Materials Science and Engineering, Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062, China
| | - Hui Yang
- School of Materials Science and Engineering, Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062, China
| | - Xiao-Jia Chen
- Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Yun Gao
- School of Materials Science and Engineering, Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062, China
| | - Zhong-Bing Huang
- School of Materials Science and Engineering, Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062, China
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35
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Bhaumik A, Sachan R, Narayan J. Magnetic relaxation and three-dimensional critical fluctuations in B-doped Q-carbon - a high-temperature superconductor. NANOSCALE 2018; 10:12665-12673. [PMID: 29946612 DOI: 10.1039/c8nr03406k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Dimensional fluctuations and magnetic relaxations in high-temperature superconductors are key considerations for practical applications in high-speed electronic devices. We report the creep of trapped magnetic flux and three-dimensional critical fluctuations near the superconducting transition temperature (Tc = 36 K) in B-doped amorphous Q-carbon. The superconducting phase in B-doped Q-carbon is formed by nanosecond pulsed laser melting in a super undercooled state followed by subsequent quenching. Time-dependent magnetic moment measurements in the B-doped Q-carbon follow the Anderson-Kim logarithmic decay model with the calculated value of pinning potential to be 0.75 eV at 1 T near Tc. There is also strong evidence of three-dimensional (3D) critical fluctuations near Tc in B-doped Q-carbon. The crossover from 2D to 3D critical fluctuations is seen at T/Tc = 1.01 as compared to T/Tc = 1.11 in conventional Bardeen-Cooper-Schrieffer (BCS) high-temperature superconductors. These critical fluctuations indicate moderate to strong electron-phonon coupling in B-doped Q-carbon. The isomagnetic temperature-dependent resistivity measurements reveal a broadening of superconducting transition width with increasing magnetic field. The upper critical field (Hc2(0)) is calculated to be 5.6 T using the power law. Finally, the superconducting region is determined in B-doped Q-carbon, as the three vertices of the superconducting region are calculated as Tc = 36.0 K, Jc = 2.9 × 109 A cm-2 and Hc2 = 5.6 T. The temperature-dependent magnetic moment and resistivity measurements also validate B-doped Q-carbon as a BCS type-II superconductor. B concentration in Q-carbon can be increased up to 50 at% by a nanosecond laser melting and quenching technique, thus providing an ideal platform for near room-temperature superconductivity.
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Affiliation(s)
- Anagh Bhaumik
- Department of Materials Science and Engineering, Centennial Campus, North Carolina State University, Raleigh, NC 27695-7907, USA.
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36
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Ishikawa H, Higuchi H, Kawaguchi M. Intercalation of Calcium into a Graphite-like Layered Material. CHEM LETT 2018. [DOI: 10.1246/cl.180236] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hiromichi Ishikawa
- Graduate School of Engineering, Osaka Electro-Communication University, 18-8 Hatsu-cho, Neyagawa, Osaka 572-8530, Japan
| | - Haruki Higuchi
- Graduate School of Engineering, Osaka Electro-Communication University, 18-8 Hatsu-cho, Neyagawa, Osaka 572-8530, Japan
| | - Masayuki Kawaguchi
- Graduate School of Engineering, Osaka Electro-Communication University, 18-8 Hatsu-cho, Neyagawa, Osaka 572-8530, Japan
- Fundamental Electronics Research Institute, Osaka Electro-Communication University, 18-8 Hatsu-cho, Neyagawa, Osaka 572-8530, Japan
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37
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Krzton-Maziopa A, Pesko E, Puzniak R. Superconducting selenides intercalated with organic molecules: synthesis, crystal structure, electric and magnetic properties, superconducting properties, and phase separation in iron based-chalcogenides and hybrid organic-inorganic superconductors. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:243001. [PMID: 29664412 DOI: 10.1088/1361-648x/aabeb5] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Layered iron-based superconducting chalcogenides intercalated with molecular species are the subject of intensive studies, especially in the field of solid state chemistry and condensed matter physics, because of their intriguing chemistry and tunable electric and magnetic properties. Considerable progress in the research, revealing superconducting inorganic-organic hybrid materials with transition temperatures to superconducting state, T c, up to 46 K, has been brought in recent years. These novel materials are synthesized by low-temperature intercalation of molecular species, such as solvates of alkali metals and nitrogen-containing donor compounds, into layered FeSe-type structure. Both the chemical nature as well as orientation of organic molecules between the layers of inorganic host, play an important role in structural modifications and may be used for fine tuning of superconducting properties. Furthermore, a variety of donor species compatible with alkali metals, as well as the possibility of doping also in the host structure (either on Fe or Se sites), makes this system quite flexible and gives a vast array of new materials with tunable electric and magnetic properties. In this review, the main aspects of intercalation chemistry are discussed with a particular attention paid to the influence of the unique nature of intercalating species on the crystal structure and physical properties of the hybrid inorganic-organic materials. To get a full picture of these materials, a comprehensive description of the most effective chemical and electrochemical methods, utilized for synthesis of intercalated species, with critical evaluation of their strong and weak points, related to feasibility of synthesis, phase purity, crystal size and morphology of final products, is included as well.
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Affiliation(s)
- Anna Krzton-Maziopa
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, PL-00-664 Warsaw, Poland
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38
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Liao JH, Zhao YC, Zhao YJ, Xu H, Yang XB. Phonon-mediated superconductivity in Mg intercalated bilayer borophenes. Phys Chem Chem Phys 2018; 19:29237-29243. [PMID: 29067396 DOI: 10.1039/c7cp06180c] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using first-principles calculations, we investigate the structural, electronic and superconducting properties of Mg intercalated bilayer borophenes BxMgBx (x = 2-5). Remarkably, B2MgB2 and B4MgB4 are predicted to exhibit good phonon-mediated superconductivity with a high transition temperature (Tc) of 23.2 K and 13.3 K, respectively, while B4MgB4 is confirmed to be more practical based on the analyses of its stability. The densities of states of in-plane orbitals at the Fermi level are found to be dominant at the superconducting transition temperature in Mg intercalated bilayer borophenes, providing an effective avenue to explore Mg-B systems with high Tcs.
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Affiliation(s)
- Ji-Hai Liao
- Department of Physics, South China University of Technology, Guangzhou 510640, P. R. China.
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39
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Nikonov K, Ehlen N, Senkovskiy B, Saigal N, Fedorov A, Nefedov A, Wöll C, Di Santo G, Petaccia L, Grüneis A. Synthesis and spectroscopic characterization of alkali–metal intercalated ZrSe2. Dalton Trans 2018; 47:2986-2991. [DOI: 10.1039/c7dt03756b] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report on the synthesis and spectroscopic characterization of alkali metal intercalated ZrSe2 single crystals.
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Affiliation(s)
| | - Niels Ehlen
- II. Physikalisches Institut
- Universität zu Köln
- 50937 Köln
- Germany
| | | | - Nihit Saigal
- II. Physikalisches Institut
- Universität zu Köln
- 50937 Köln
- Germany
| | | | - Alexei Nefedov
- Institut für Funktionelle Grenzflächen
- Karlsruher Institut für Technologie
- Eggenstein-Leopoldshafen
- Germany
| | - Christof Wöll
- Institut für Funktionelle Grenzflächen
- Karlsruher Institut für Technologie
- Eggenstein-Leopoldshafen
- Germany
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40
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Zhong GH, Yang DY, Zhang K, Wang RS, Zhang C, Lin HQ, Chen XJ. Superconductivity and phase stability of potassium-doped biphenyl. Phys Chem Chem Phys 2018; 20:25217-25223. [DOI: 10.1039/c8cp05184d] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Meissner effect is observed in potassium-doped biphenyl and the crystal structure is predicted.
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Affiliation(s)
- Guo-Hua Zhong
- Shenzhen Institutes of Advanced Technology
- Chinese Academy of Sciences
- Shenzhen 518055
- China
| | - Dong-Yu Yang
- Center for High Pressure Science and Technology Advanced Research
- Shanghai 201203
- China
| | - Kai Zhang
- Center for High Pressure Science and Technology Advanced Research
- Shanghai 201203
- China
| | - Ren-Shu Wang
- Center for High Pressure Science and Technology Advanced Research
- Shanghai 201203
- China
| | - Chao Zhang
- Department of Physics
- Yantai University
- Yantai
- China
| | - Hai-Qing Lin
- Beijing Computational Science Research Center
- Beijing
- China
| | - Xiao-Jia Chen
- Center for High Pressure Science and Technology Advanced Research
- Shanghai 201203
- China
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Abellán G, Neiss C, Lloret V, Wild S, Chacón-Torres JC, Werbach K, Fedi F, Shiozawa H, Görling A, Peterlik H, Pichler T, Hauke F, Hirsch A. Exploring the Formation of Black Phosphorus Intercalation Compounds with Alkali Metals. Angew Chem Int Ed Engl 2017; 56:15267-15273. [PMID: 28980764 PMCID: PMC5846882 DOI: 10.1002/anie.201707462] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2017] [Indexed: 01/09/2023]
Abstract
Black phosphorus intercalation compounds (BPICs) with alkali metals (namely: K and Na) have been synthesized in bulk by solid‐state as well as vapor‐phase reactions. By means of a combination of in situ X‐ray diffraction, Raman spectroscopy, and DFT calculations the structural behavior of the BPICs at different intercalation stages has been demonstrated for the first time. Our results provide a glimpse into the very first steps of a new family of intercalation compounds, with a distinct behavior as compared to its graphite analogues (GICs), showing a remarkable structural complexity and a dynamic behavior.
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Affiliation(s)
- Gonzalo Abellán
- Chair of Organic Chemistry II and Joint Institute of Advanced Materials and Processes (ZMP), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Henkestrasse 42, 91054, Erlangen, Germany
| | - Christian Neiss
- Lehrstuhl für Theoretische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstrasse 3, 91058, Erlangen, Germany
| | - Vicent Lloret
- Chair of Organic Chemistry II and Joint Institute of Advanced Materials and Processes (ZMP), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Henkestrasse 42, 91054, Erlangen, Germany
| | - Stefan Wild
- Chair of Organic Chemistry II and Joint Institute of Advanced Materials and Processes (ZMP), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Henkestrasse 42, 91054, Erlangen, Germany
| | - Julio C Chacón-Torres
- Yachay Tech University, School of Physical Sciences and Nanotechnology, Urcuquí, 100119, Ecuador.,Institut für Experimental Physik, Freie Universität Berlin, Arnimallee 14, 14195, Berlin, Germany
| | - Katharina Werbach
- Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090, Vienna, Austria
| | - Filippo Fedi
- Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090, Vienna, Austria
| | - Hidetsugu Shiozawa
- Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090, Vienna, Austria
| | - Andreas Görling
- Lehrstuhl für Theoretische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstrasse 3, 91058, Erlangen, Germany
| | - Herwig Peterlik
- Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090, Vienna, Austria
| | - Thomas Pichler
- Faculty of Physics, University of Vienna, Strudlhofgasse 4, 1090, Vienna, Austria
| | - Frank Hauke
- Chair of Organic Chemistry II and Joint Institute of Advanced Materials and Processes (ZMP), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Henkestrasse 42, 91054, Erlangen, Germany
| | - Andreas Hirsch
- Chair of Organic Chemistry II and Joint Institute of Advanced Materials and Processes (ZMP), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Henkestrasse 42, 91054, Erlangen, Germany
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Abellán G, Neiss C, Lloret V, Wild S, Chacón-Torres JC, Werbach K, Fedi F, Shiozawa H, Görling A, Peterlik H, Pichler T, Hauke F, Hirsch A. Exploring the Formation of Black Phosphorus Intercalation Compounds with Alkali Metals. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201707462] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Gonzalo Abellán
- Chair of Organic Chemistry II and Joint Institute of Advanced Materials and Processes (ZMP); Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU); Henkestrasse 42 91054 Erlangen Germany
| | - Christian Neiss
- Lehrstuhl für Theoretische Chemie; Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU); Egerlandstrasse 3 91058 Erlangen Germany
| | - Vicent Lloret
- Chair of Organic Chemistry II and Joint Institute of Advanced Materials and Processes (ZMP); Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU); Henkestrasse 42 91054 Erlangen Germany
| | - Stefan Wild
- Chair of Organic Chemistry II and Joint Institute of Advanced Materials and Processes (ZMP); Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU); Henkestrasse 42 91054 Erlangen Germany
| | - Julio C. Chacón-Torres
- Yachay Tech University; School of Physical Sciences and Nanotechnology; Urcuquí 100119 Ecuador
- Institut für Experimental Physik; Freie Universität Berlin; Arnimallee 14 14195 Berlin Germany
| | - Katharina Werbach
- Faculty of Physics; University of Vienna; Strudlhofgasse 4 1090 Vienna Austria
| | - Filippo Fedi
- Faculty of Physics; University of Vienna; Strudlhofgasse 4 1090 Vienna Austria
| | - Hidetsugu Shiozawa
- Faculty of Physics; University of Vienna; Strudlhofgasse 4 1090 Vienna Austria
| | - Andreas Görling
- Lehrstuhl für Theoretische Chemie; Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU); Egerlandstrasse 3 91058 Erlangen Germany
| | - Herwig Peterlik
- Faculty of Physics; University of Vienna; Strudlhofgasse 4 1090 Vienna Austria
| | - Thomas Pichler
- Faculty of Physics; University of Vienna; Strudlhofgasse 4 1090 Vienna Austria
| | - Frank Hauke
- Chair of Organic Chemistry II and Joint Institute of Advanced Materials and Processes (ZMP); Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU); Henkestrasse 42 91054 Erlangen Germany
| | - Andreas Hirsch
- Chair of Organic Chemistry II and Joint Institute of Advanced Materials and Processes (ZMP); Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU); Henkestrasse 42 91054 Erlangen Germany
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43
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Nishiyama S, Fujita H, Hoshi M, Miao X, Terao T, Yang X, Miyazaki T, Goto H, Kagayama T, Shimizu K, Yamaoka H, Ishii H, Liao YF, Kubozono Y. Preparation and characterization of a new graphite superconductor: Ca 0.5Sr 0.5C 6. Sci Rep 2017; 7:7436. [PMID: 28785117 PMCID: PMC5547157 DOI: 10.1038/s41598-017-07763-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 06/29/2017] [Indexed: 11/09/2022] Open
Abstract
We have produced a superconducting binary-elements intercalated graphite, CaxSr1-xCy, with the intercalation of Sr and Ca in highly-oriented pyrolytic graphite; the superconducting transition temperature, T c, was ~3 K. The superconducting CaxSr1-xCy sample was fabricated with the nominal x value of 0.8, i.e., Ca0.8Sr0.2Cy. Energy dispersive X-ray (EDX) spectroscopy provided the stoichiometry of Ca0.5(2)Sr0.5(2)Cy for this sample, and the X-ray powder diffraction (XRD) pattern showed that Ca0.5(2)Sr0.5(2)Cy took the SrC6-type hexagonal-structure rather than CaC6-type rhombohedral-structure. Consequently, the chemical formula of CaxSr1-xCy sample could be expressed as 'Ca0.5(2)Sr0.5(2)C6'. The XRD pattern of Ca0.5(2)Sr0.5(2)C6 was measured at 0-31 GPa, showing that the lattice shrank monotonically with increasing pressure up to 8.6 GPa, with the structural phase transition occurring above 8.6 GPa. The pressure dependence of T c was determined from the DC magnetic susceptibility and resistance up to 15 GPa, which exhibited a positive pressure dependence of T c up to 8.3 GPa, as in YbC6, SrC6, KC8, CaC6 and Ca0.6K0.4C8. The further application of pressure caused the rapid decrease of T c. In this study, the fabrication and superconducting properties of new binary-elements intercalated graphite, CaxSr1-xCy, are fully investigated, and suitable combinations of elements are suggested for binary-elements intercalated graphite.
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Affiliation(s)
- Saki Nishiyama
- Research Institute for Interdisciplinary Science, Okayama University, Okayama, 700-8530, Japan
| | - Hidenori Fujita
- Center for Science and Technology under Extreme Conditions, Graduate School of Engineering Science, Osaka University, Osaka, 560-8531, Japan
| | - Masatoshi Hoshi
- Center for Science and Technology under Extreme Conditions, Graduate School of Engineering Science, Osaka University, Osaka, 560-8531, Japan
| | - Xiao Miao
- Research Institute for Interdisciplinary Science, Okayama University, Okayama, 700-8530, Japan
| | - Takahiro Terao
- Research Institute for Interdisciplinary Science, Okayama University, Okayama, 700-8530, Japan
| | - Xiaofan Yang
- Research Institute for Interdisciplinary Science, Okayama University, Okayama, 700-8530, Japan
| | - Takafumi Miyazaki
- Research Laboratory for Surface Science, Okayama University, Okayama, 700-8530, Japan
| | - Hidenori Goto
- Research Institute for Interdisciplinary Science, Okayama University, Okayama, 700-8530, Japan
| | - Tomoko Kagayama
- Center for Science and Technology under Extreme Conditions, Graduate School of Engineering Science, Osaka University, Osaka, 560-8531, Japan
| | - Katsuya Shimizu
- Center for Science and Technology under Extreme Conditions, Graduate School of Engineering Science, Osaka University, Osaka, 560-8531, Japan
| | - Hitoshi Yamaoka
- RIKEN SPring-8 Center, RIKEN, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan
| | - Hirofumi Ishii
- National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
| | - Yen-Fa Liao
- National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
| | - Yoshihiro Kubozono
- Research Institute for Interdisciplinary Science, Okayama University, Okayama, 700-8530, Japan.
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44
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Zhang M, Guo Y, Zhu L, Feng X, Redfern SAT, Chen J, Liu H, Tse JS. Crystal Structures of CaB 3N 3 at High Pressures. Inorg Chem 2017; 56:7449-7453. [PMID: 28598603 DOI: 10.1021/acs.inorgchem.7b00904] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Using global structure searches, we have explored the structural stability of CaB3N3, a compound analogous to CaC6, under pressure. There are two high-pressure phases with space groups R3c and Amm2 that were found to be stable between 29 and 42 GPa, and above 42 GPa, respectively. The two phases show different structural frameworks, analogous to graphitic CaC6. Phonon calculations confirm that both structures are also dynamically stable at high pressures. The electronic structure calculations show that the R3c phase is a semiconductor with a band gap of 2.21 eV and that the Amm2 phase is a semimetal. These findings help advance our understanding of the Ca-B-N ternary system.
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Affiliation(s)
- Miao Zhang
- College of Physics, Beihua University , Jilin 132013, China.,Center for High Pressure Science and Technology Advanced Research , Changchun 130015, China
| | - Yanan Guo
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun 130012, China
| | - Li Zhu
- Geophysical Laboratory, Carnegie Institution of Washington , Washington, D.C. 20015, United States
| | - Xiaolei Feng
- State Key Laboratory of Superhard Materials, Jilin University , Changchun 130012, China
| | - Simon A T Redfern
- Department of Earth Sciences, University of Cambridge , Downing Street, Cambridge CB2 3EQ, United Kingdom.,Center for High Pressure Science and Technology Advanced Research , 1690 Cailun Road, Pudong, Shanghai 201203, China
| | - Jiuhua Chen
- Center for High Pressure Science and Technology Advanced Research , Changchun 130015, China.,Center for the Study of Matter at Extreme Conditions, Florida International University , Miami, Florida 33199, United States
| | - Hanyu Liu
- Geophysical Laboratory, Carnegie Institution of Washington , Washington, D.C. 20015, United States
| | - John S Tse
- Center for High Pressure Science and Technology Advanced Research , Changchun 130015, China.,State Key Laboratory of Superhard Materials, Jilin University , Changchun 130012, China.,Department of Physics and Engineering Physics, University of Saskatchewan , Saskatoon, Saskatchewan S7N 5E2, Canada
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45
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Lian CS, Wang JT, Duan W, Chen C. Phonon-mediated high-T c superconductivity in hole-doped diamond-like crystalline hydrocarbon. Sci Rep 2017; 7:1464. [PMID: 28469256 PMCID: PMC5431101 DOI: 10.1038/s41598-017-01541-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Accepted: 03/16/2017] [Indexed: 11/24/2022] Open
Abstract
We here predict by ab initio calculations phonon-mediated high-Tc superconductivity in hole-doped diamond-like cubic crystalline hydrocarbon K4-CH (space group I21/3). This material possesses three key properties: (i) an all-sp3 covalent carbon framework that produces high-frequency phonon modes, (ii) a steep-rising electronic density of states near the top of the valence band, and (iii) a Fermi level that lies in the σ-band, allowing for a strong coupling with the C-C bond-stretching modes. The simultaneous presence of these properties generates remarkably high superconducting transition temperatures above 80 K at an experimentally accessible hole doping level of only a few percent. These results identify a new extraordinary electron-phonon superconductor and pave the way for further exploration of this novel superconducting covalent metal.
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Affiliation(s)
- Chao-Sheng Lian
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Jian-Tao Wang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China. .,School of Physics, University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Wenhui Duan
- Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing, 100084, China
| | - Changfeng Chen
- Department of Physics and High Pressure Science and Engineering Center, University of Nevada, Las Vegas, Nevada, 89154, USA
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46
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Liu Y, Liang H, Xu Z, Xi J, Chen G, Gao W, Xue M, Gao C. Superconducting Continuous Graphene Fibers via Calcium Intercalation. ACS NANO 2017; 11:4301-4306. [PMID: 28353342 DOI: 10.1021/acsnano.7b01491] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Superconductors are important materials in the field of low-temperature magnet applications and long-distance electrical power transmission systems. Besides metal-based superconducting materials, carbon-based superconductors have attracted considerable attention in recent years. Up to now, five allotropes of carbon, including diamond, graphite, C60, CNTs, and graphene, have been reported to show superconducting behavior. However, most of the carbon-based superconductors are limited to small size and discontinuous phases, which inevitably hinders further application in macroscopic form. Therefore, it raises a question of whether continuously carbon-based superconducting wires could be accessed, which is of vital importance from viewpoints of fundamental research and practical application. Here, inspired by superconducting graphene, we successfully fabricated flexible graphene-based superconducting fibers via a well-established calcium (Ca) intercalation strategy. The resultant Ca-intercalated graphene fiber (Ca-GF) shows a superconducting transition at ∼11 K, which is almost 2 orders of magnitude higher than that of early reported alkali metal intercalated graphite and comparable to that of commercial superconducting NbTi wire. The combination of lightness and easy scalability makes Ca-GF highly promising as a lightweight superconducting wire.
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Affiliation(s)
- Yingjun Liu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University , 38 Zheda Road, Hangzhou 310027, People's Republic of China
| | - Hui Liang
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China
| | - Zhen Xu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University , 38 Zheda Road, Hangzhou 310027, People's Republic of China
| | - Jiabin Xi
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University , 38 Zheda Road, Hangzhou 310027, People's Republic of China
| | - Genfu Chen
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China
| | - Weiwei Gao
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University , 38 Zheda Road, Hangzhou 310027, People's Republic of China
| | - Mianqi Xue
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, People's Republic of China
| | - Chao Gao
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Zhejiang University , 38 Zheda Road, Hangzhou 310027, People's Republic of China
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Tamura S, Katayama N, Yamada Y, Sugiyama Y, Sugawara K, Sawa H. Various Arsenic Network Structures in 112-Type Ca1–xLaxFe1–yPdyAs2 Revealed by Synchrotron X-ray Diffraction Experiments. Inorg Chem 2017; 56:3030-3035. [DOI: 10.1021/acs.inorgchem.6b03115] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shinya Tamura
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Naoyuki Katayama
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Yuto Yamada
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Yuki Sugiyama
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Kento Sugawara
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
| | - Hiroshi Sawa
- Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan
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48
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Matsui F, Eguchi R, Nishiyama S, Izumi M, Uesugi E, Goto H, Matsushita T, Sugita K, Daimon H, Hamamoto Y, Hamada I, Morikawa Y, Kubozono Y. Photoelectron Holographic Atomic Arrangement Imaging of Cleaved Bimetal-intercalated Graphite Superconductor Surface. Sci Rep 2016; 6:36258. [PMID: 27811975 PMCID: PMC5095891 DOI: 10.1038/srep36258] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Accepted: 10/11/2016] [Indexed: 01/04/2023] Open
Abstract
From the C 1s and K 2p photoelectron holograms, we directly reconstructed atomic images of the cleaved surface of a bimetal-intercalated graphite superconductor, (Ca, K)C8, which differed substantially from the expected bulk crystal structure based on x-ray diffraction (XRD) measurements. Graphene atomic images were collected in the in-plane cross sections of the layers 3.3 Å and 5.7 Å above the photoelectron emitter C atom and the stacking structures were determined as AB- and AA-type, respectively. The intercalant metal atom layer was found between two AA-stacked graphenes. The K atomic image revealing 2 × 2 periodicity, occupying every second centre site of C hexagonal columns, was reconstructed, and the Ca 2p peak intensity in the photoelectron spectra of (Ca, K)C8 from the cleaved surface was less than a few hundredths of the K 2p peak intensity. These observations indicated that cleavage preferentially occurs at the KC8 layers containing no Ca atoms.
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Affiliation(s)
- Fumihiko Matsui
- Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
| | - Ritsuko Eguchi
- Research Laboratory for Surface Science, Okayama University, Okayama 700-8530, Japan
| | - Saki Nishiyama
- Research Laboratory for Surface Science, Okayama University, Okayama 700-8530, Japan
| | - Masanari Izumi
- Research Laboratory for Surface Science, Okayama University, Okayama 700-8530, Japan
| | - Eri Uesugi
- Research Laboratory for Surface Science, Okayama University, Okayama 700-8530, Japan
| | - Hidenori Goto
- Research Laboratory for Surface Science, Okayama University, Okayama 700-8530, Japan
| | - Tomohiro Matsushita
- Japan Synchrotron Radiation Research Institute, SPring-8, Sayo, Hyogo 679-5198, Japan
| | - Kenji Sugita
- Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
| | - Hiroshi Daimon
- Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
| | - Yuji Hamamoto
- Graduate School of Engineering, Osaka University, Suita 565-0871, Japan
| | - Ikutaro Hamada
- International Center for Materials Nanoarchitectonics (WPI-MANA) and Global Research Center for Environmental and Energy based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS), 1-1 Namiki Tsukuba 305-0044, Japan
| | | | - Yoshihiro Kubozono
- Research Laboratory for Surface Science, Okayama University, Okayama 700-8530, Japan
- Research Centre of New Functional Materials for Energy Production, Storage and Transport, Okayama University, Okayama 700-8530, Japan
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Wu Q, Zhang JJ, Hao P, Ji Z, Dong S, Ling C, Chen Q, Wang J. Versatile Titanium Silicide Monolayers with Prominent Ferromagnetic, Catalytic, and Superconducting Properties: Theoretical Prediction. J Phys Chem Lett 2016; 7:3723-3729. [PMID: 27603004 DOI: 10.1021/acs.jpclett.6b01731] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
On the basis of global structure search and density functional theory calculations, we predict a new class of two-dimensional (2D) materials, titanium silicide (Ti2Si, TiSi2, and TiSi4) monolayers. They are proved to be energetically, dynamically, and thermally stable and own excellent mechanical properties. Among them, Ti2Si is a ferromagnetic metal with a magnetic moment of 1.37 μB/cell, while TiSi2 is an ideal catalyst for the hydrogen evolution reaction with a nearly zero free energy of hydrogen adsorption. More importantly, electron-phonon coupling calculations suggest that TiSi4 is a robust 2D phonon-mediated superconductor with a transition temperature of 5.8 K, and the transition temperature can be enhanced up to 11.7 K under a suitable external strain. The versatility makes titanium silicide monolayers promising candidates for spintronic materials, hydrogen evolution catalysts, and 2D superconductors.
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Affiliation(s)
- Qisheng Wu
- Department of Physics, Southeast University , Nanjing 211189, People's Republic of China
| | - Jun-Jie Zhang
- Department of Physics, Southeast University , Nanjing 211189, People's Republic of China
| | - Peipei Hao
- Department of Physics, Southeast University , Nanjing 211189, People's Republic of China
| | - Zhongyang Ji
- Department of Physics, Southeast University , Nanjing 211189, People's Republic of China
| | - Shuai Dong
- Department of Physics, Southeast University , Nanjing 211189, People's Republic of China
| | - Chongyi Ling
- Department of Physics, Southeast University , Nanjing 211189, People's Republic of China
| | - Qian Chen
- Department of Physics, Southeast University , Nanjing 211189, People's Republic of China
| | - Jinlan Wang
- Department of Physics, Southeast University , Nanjing 211189, People's Republic of China
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Kubozono Y, Eguchi R, Goto H, Hamao S, Kambe T, Terao T, Nishiyama S, Zheng L, Miao X, Okamoto H. Recent progress on carbon-based superconductors. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:334001. [PMID: 27351938 DOI: 10.1088/0953-8984/28/33/334001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This article reviews new superconducting phases of carbon-based materials. During the past decade, new carbon-based superconductors have been extensively developed through the use of intercalation chemistry, electrostatic carrier doping, and surface-proving techniques. The superconducting transition temperature T c of these materials has been rapidly elevated, and the variety of superconductors has been increased. This review fully introduces graphite, graphene, and hydrocarbon superconductors and future perspectives of high-T c superconductors based on these materials, including present problems. Carbon-based superconductors show various types of interesting behavior, such as a positive pressure dependence of T c. At present, experimental information on superconductors is still insufficient, and theoretical treatment is also incomplete. In particular, experimental results are still lacking for graphene and hydrocarbon superconductors. Therefore, it is very important to review experimental results in detail and introduce theoretical approaches, for the sake of advances in condensed matter physics. Furthermore, the recent experimental results on hydrocarbon superconductors obtained by our group are also included in this article. Consequently, this review article may provide a hint to designing new carbon-based superconductors exhibiting higher T c and interesting physical features.
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Affiliation(s)
- Yoshihiro Kubozono
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
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