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Okur HE, Colman RH, Takabayashi Y, Jeglič P, Ohishi Y, Kato K, Arčon D, Kubota Y, Prassides K. Fulleride superconductivity tuned by elastic strain due to cation compositional disorder. Chem Sci 2024:d4sc03399j. [PMID: 39263659 PMCID: PMC11382541 DOI: 10.1039/d4sc03399j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2024] [Accepted: 09/03/2024] [Indexed: 09/13/2024] Open
Abstract
Dynamical fluctuations of the elastic strain in strongly correlated systems are known to affect the onset of metal-to-insulator or superconducting transitions. Here we report their effect on the properties of a family of bandwidth-controlled alkali-intercalated fullerene superconductors. We introduce elastic strain through static local structural disorder in a systematic and controllable way in the fcc-structured K x Cs3-x C60 (with potassium content, 0.22 ≤ x K ≤ 2) series of compositions by utilizing the difference in size between the K+ and Cs+ co-dopants. The occurrence of the crossover from the Mott-Jahn-Teller insulating (MJTI) state into the strongly correlated Jahn-Teller metal (JTM) on cooling is evidenced for the compositions with x K < 1.28 by both synchrotron X-ray powder diffraction (SXRPD) - anomalous reduction of the unit cell volume - and 133Cs NMR spectroscopy - sudden suppression in the 133Cs spin-lattice relaxation rates. The emerging superconducting state with a maximum critical temperature, T c = 30.9 K shows a characteristic dome-like dependence on the unit-cell volume or equivalently, on the ratio between the on-site Coulomb repulsion, U, and the bandwidth, W. However, compared to the parent Cs3C60 composition in which cation disorder effects are completely absent, the maximum T c is lower by ∼12%. The reduction in T c displays a linear dependence on the variance of the tetrahedral-site cation size, σ T 2, thus establishing a clear link between structural-disorder-induced attenuation of critical elastic strain fluctuations and the electronic ground state.
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Affiliation(s)
- H Esma Okur
- Department of Chemistry, Faculty of Engineering and Natural Sciences, Bursa Technical University TR-16310 Bursa Turkey
| | - Ross H Colman
- Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University 121 16 Prague Czech Republic
| | - Yasuhiro Takabayashi
- Department of Physical Science and Engineering, Nagoya Institute of Technology Nagoya 466-8555 Japan
| | - Peter Jeglič
- Jozef Stefan Institute Jamova c. 39 SI-1000 Ljubljana Slovenia
| | - Yasuo Ohishi
- Japan Synchrotron Radiation Facility, SPring-8 Hyogo 679-5198 Japan
| | | | - Denis Arčon
- Jozef Stefan Institute Jamova c. 39 SI-1000 Ljubljana Slovenia
- Faculty of Mathematics and Physics, University of Ljubljana Jadranska c. 19 SI-1000 Ljubljana Slovenia
| | - Yoshiki Kubota
- Department of Physics, Graduate School of Science, Osaka Metropolitan University Osaka 599-8531 Japan
| | - Kosmas Prassides
- Jozef Stefan Institute Jamova c. 39 SI-1000 Ljubljana Slovenia
- Department of Physics, Graduate School of Science, Osaka Metropolitan University Osaka 599-8531 Japan
- Faculty of Engineering, Kyoto University of Advanced Science Kameoka 621-8555 Japan
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2
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Zhu Y, Borstelmann J, Bertleff O, Bergner J, Wei Z, Neiss C, Görling A, Kivala M, Petrukhina MA. Unveiling the Multielectron Acceptor Properties of π-Expanded Pyracylene: Reversible Boat to Chair Conversion. J Am Chem Soc 2024; 146:14715-14723. [PMID: 38741481 PMCID: PMC11140751 DOI: 10.1021/jacs.4c02314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Revised: 05/04/2024] [Accepted: 05/06/2024] [Indexed: 05/16/2024]
Abstract
In this work, the chemical reduction of a hybrid pyracylene-hexa-peri-hexabenzocoronene (HPH) nanographene was investigated with different alkali metals (Na, K, Rb) to reveal its remarkable multielectron acceptor abilities. The UV-vis and 1H NMR spectroscopy monitoring of the stepwise reduction reactions supports the existence of all intermediate reduction states up to the hexaanion for HPH. Tuning the experimental conditions enabled the synthesis of the HPH anions with gradually increasing reduction states (up to -5) isolated with different alkali metal ions as crystalline materials. The single-crystal X-ray diffraction structure analysis demonstrates that the highly negatively charged HPH anions (-4 and -5) exhibit a drastic geometry change from boat-shaped (observed in the neutral parent, mono- and dianions) to a chair conformation, which was proved to be fully reversible by NMR spectroscopy. DFT calculations show that this geometry change is induced by an enhanced interaction between the coordinated metal ions and negatively charged HPH core in the chair conformation.
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Affiliation(s)
- Yikun Zhu
- Department
of Chemistry, University at Albany, State
University of New York, Albany, New York 12222, United States
| | - Jan Borstelmann
- Organisch-Chemisches
Institut, Universität Heidelberg, Im Neuenheimer Feld 270, Heidelberg 69120, Germany
| | - Oliver Bertleff
- Lehrstuhl
für Theoretische Chemie, Friedrich-Alexander
Universität Erlangen-Nürnberg (FAU), Egerlandstraße 3, Erlangen 91058, Germany
| | - John Bergner
- Organisch-Chemisches
Institut, Universität Heidelberg, Im Neuenheimer Feld 270, Heidelberg 69120, Germany
| | - Zheng Wei
- Department
of Chemistry, University at Albany, State
University of New York, Albany, New York 12222, United States
| | - Christian Neiss
- Lehrstuhl
für Theoretische Chemie, Friedrich-Alexander
Universität Erlangen-Nürnberg (FAU), Egerlandstraße 3, Erlangen 91058, Germany
| | - Andreas Görling
- Lehrstuhl
für Theoretische Chemie, Friedrich-Alexander
Universität Erlangen-Nürnberg (FAU), Egerlandstraße 3, Erlangen 91058, Germany
- Erlangen
National High Performance Computing Center (NHR@FAU), Martensstr. 1, Erlangen 91058, Germany
| | - Milan Kivala
- Organisch-Chemisches
Institut, Universität Heidelberg, Im Neuenheimer Feld 270, Heidelberg 69120, Germany
| | - Marina A. Petrukhina
- Department
of Chemistry, University at Albany, State
University of New York, Albany, New York 12222, United States
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3
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Pandey P, Wang X, Gupta H, Smith PW, Lapsheva E, Carroll PJ, Bacon AM, Booth CH, Minasian SG, Autschbach J, Zurek E, Schelter EJ. Realization of Organocerium-Based Fullerene Molecular Materials Showing Mott Insulator-Type Behavior. ACS APPLIED MATERIALS & INTERFACES 2024; 16:17857-17869. [PMID: 38533949 DOI: 10.1021/acsami.3c18766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/28/2024]
Abstract
Electron-rich organocerium complexes (C5Me4H)3Ce and [(C5Me5)2Ce(ortho-oxa)], with redox potentials E1/2 = -0.82 V and E1/2 = -0.86 V versus Fc/Fc+, respectively, were reacted with fullerene (C60) in different stoichiometries to obtain molecular materials. Structurally characterized cocrystals: [(C5Me4H)3Ce]2·C60 (1) and [(C5Me5)2Ce(ortho-oxa)]3·C60 (2) of C60 with cerium-based, molecular rare earth precursors are reported for the first time. The extent of charge transfer in 1 and 2 was evaluated using a series of physical measurements: FT-IR, Raman, solid-state UV-vis-NIR spectroscopy, X-ray absorption near-edge structure (XANES) spectroscopy, and magnetic susceptibility measurements. The physical measurements indicate that 1 and 2 comprise the cerium(III) oxidation state, with formally neutral C60 as a cocrystal in both cases. Pressure-dependent periodic density functional theory calculations were performed to study the electronic structure of 1. Inclusion of a Hubbard-U parameter removes Ce f states from the Fermi level, opens up a band gap, and stabilizes FM/AFM magnetic solutions that are isoenergetic because of the large distances between the Ce(III) cations. The electronic structure of this strongly correlated Mott insulator-type system is reminiscent of the well-studied Ce2O3.
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Affiliation(s)
- Pragati Pandey
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - Xiaoyu Wang
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260, United States
| | - Himanshu Gupta
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - Patrick W Smith
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Ekaterina Lapsheva
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - Patrick J Carroll
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - Alexandra M Bacon
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
| | - Corwin H Booth
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Stefan G Minasian
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Jochen Autschbach
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260, United States
| | - Eva Zurek
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260, United States
| | - Eric J Schelter
- P. Roy and Diana T. Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34 Street, Philadelphia, Pennsylvania 19104, United States
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4
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Feng J, Qiu Y, Gao H, Wu Y. Crystal Self-Assembly under Confinement: Bridging Nanomaterials to Integrated Devices. Acc Chem Res 2024; 57:222-233. [PMID: 38170611 DOI: 10.1021/acs.accounts.3c00603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
ConspectusSelf-assembly, a spontaneous process that organizes disordered constituents into ordered structures, has revolutionized our fundamental understanding of living matter, nanotechnology, and molecular science. From the perspective of nanomaterials, self-assembly serves as a bottom-up method for creating long-range-ordered materials. This is accomplished by tailoring the geometry, chemistry, and interactions of the components, thereby facilitating the efficient fabrication of high-quality materials and high-performance functional devices. Over the past few decades, we have seen controllable organization and diverse phases in self-assembled materials, such as organic crystals, biomolecular structures, and colloidal nanoparticle supercrystals. However, most self-assembled ordered materials and their assembly mechanisms are derived from constituents in a liquid bulk medium, where the effects of boundaries and interfaces are negligible. In the context of nanostructure patterning, self-assembly occurs in confined spaces, with feature sizes ranging from a few to hundreds of nanometers. In such settings, ubiquitous boundaries and interfaces can trap the system in a kinetically favored but metastable state, devoid of long-range order. This makes it extremely difficult to achieve ordered structures in micro/nano-patterning techniques that rely on sessile microdroplets, such as inkjet printing, dip-pen lithography, and contact printing.In stark contrast to sessile droplets, capillary bridges─formed by liquids confined between two solid surfaces─provide unique opportunities for understanding the long-range-ordered self-assembly of crystalline materials under spatial confinement. Because capillary bridges are stabilized by Laplace pressure, which is inversely proportional to the feature size, the confinement and manipulation of solutions or suspensions of functional materials at the nanoscale become accessible through the rational design of surface chemistry and geometry. Although global thermodynamic equilibrium is unattainable in evaporative systems, ordered nucleation and packing of constituent components can be locally realized at the contact line of capillary bridges. This enables the unprecedented fabrication of long-range-ordered micro/nanostructures with deterministic patterns.In this Account, we review the advancements in long-range-ordered self-assembly of crystalline micro/nanostructures under confinement. First, we briefly introduce crystalline materials characterized by strong intramolecular interactions and relatively weak intermolecular forces, analyzing both the opportunities and challenges inherent to self-assembled nanomaterials. Next, we delve into the construction and manipulation of confined liquids, focusing especially on capillary bridges controlled by engineered chemistry and geometry to regulate Laplace pressure. Through this approach, we have achieved capillary bridges with thicknesses on the order of a few nanometers and wafer-scale homogeneity, facilitating the self-assembly of ordered structures. Supported by factors such as local free-volume entropy, electrostatic interactions, curvilinear geometry, directional microfluidics, and nanoconfinement, we have achieved long-range-ordered, deterministic patterning of organic semiconductors, metal-halide perovskites, and colloidal nanocrystal superlattices using this capillary-bridge platform. These long-range microstructures serve as a bridge between nanomaterials and integrated devices, enabling emergent functionalities like intrinsic stretchability, giant photoconductivity, propagating and interacting exciton polaritons, and spin-valley-locked lasing, which are otherwise unattainable in disordered materials. Finally, we discuss potential directions for both the fundamental understanding and practical applications of confined self-assembly.
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Affiliation(s)
- Jiangang Feng
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
| | - Yuchen Qiu
- College of Chemistry, Jilin University, Changchun, Jilin 130012, P. R. China
| | - Hanfei Gao
- Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou, Jiangsu 215123, P. R. China
| | - Yuchen Wu
- Key Laboratory of Bio-Inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P.R. China
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5
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Hai Y, Jiang M, Tian H, Zhong G, Li W, Yang C, Chen X, Lin H. Superconductivity Above 100 K Predicted in Carbon-Cage Network. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2303639. [PMID: 37807820 PMCID: PMC10667821 DOI: 10.1002/advs.202303639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Revised: 08/22/2023] [Indexed: 10/10/2023]
Abstract
To explore carbide superconductors with higher transition temperature, two novel carbon structures of cage-network are designed and their superconductivity is studied by doping metals. MC6 and MC10 are respectively identified as C24 and C32 cage-network structures. This study finds that both carbon structures drive strong electron-phonon interaction and can exhibit superconductivity above liquid nitrogen temperature. Importantly, the superconducting transition temperatures above 100 K are predicted to be achieved in C24 -cage-network systems doped by Na, Mg, Al, In, and Tl at ambient pressure, which is far higher than those in graphite, fullerene, and other carbides. Meanwhile, the superconductivity of cage-network carbides is also found to be sensitive to the electronegativity and concentration of dopant M. The result indicates that the higher transition temperatures can be obtained by optimizing the carbon-cage-network structures and the doping conditions. The study suggests that the carbon-cage-network structure is a direction to explore high-temperature superconducting carbides.
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Affiliation(s)
- Yu‐Long Hai
- Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China
- Nano Science and Technology InstituteUniversity of Science and Technology of ChinaSuzhou215123China
| | - Meng‐Jing Jiang
- Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China
- Nano Science and Technology InstituteUniversity of Science and Technology of ChinaSuzhou215123China
| | - Hui‐Li Tian
- Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China
- Nano Science and Technology InstituteUniversity of Science and Technology of ChinaSuzhou215123China
| | - Guo‐Hua Zhong
- Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China
- University of Chinese Academy of SciencesBeijing100049China
| | - Wen‐Jie Li
- Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China
- University of Chinese Academy of SciencesBeijing100049China
| | - Chun‐Lei Yang
- Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China
- University of Chinese Academy of SciencesBeijing100049China
| | - Xiao‐Jia Chen
- School of ScienceHarbin Institute of TechnologyShenzhen518055China
- Center for High Pressure Science and Technology Advanced ResearchShanghai201203China
| | - Hai‐Qing Lin
- School of PhysicsZhejiang UniversityHangzhou310058China
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6
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Zhou JS, Xu RZ, Yu XQ, Cheng FJ, Zhao WX, Du X, Wang SZ, Zhang QQ, Gu X, He SM, Li YD, Ren MQ, Ma XC, Xue QK, Chen YL, Song CL, Yang LX. Evidence for Band Renormalizations in Strong-Coupling Superconducting Alkali-Fulleride Films. PHYSICAL REVIEW LETTERS 2023; 130:216004. [PMID: 37295091 DOI: 10.1103/physrevlett.130.216004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 02/06/2023] [Accepted: 04/17/2023] [Indexed: 06/12/2023]
Abstract
There has been a long-standing debate about the mechanism of the unusual superconductivity in alkali-intercalated fullerides. In this Letter, using high-resolution angle-resolved photoemission spectroscopy, we systematically investigate the electronic structures of superconducting K_{3}C_{60} thin films. We observe a dispersive energy band crossing the Fermi level with the occupied bandwidth of about 130 meV. The measured band structure shows prominent quasiparticle kinks and a replica band involving the Jahn-Teller active phonon modes, which reflects strong electron-phonon coupling in the system. The electron-phonon coupling constant is estimated to be about 1.2, which dominates the quasiparticle mass renormalization. Moreover, we observe an isotropic nodeless superconducting gap beyond the mean-field estimation (2Δ/k_{B}T_{c}≈5). Both the large electron-phonon coupling constant and large reduced superconducting gap suggest a strong-coupling superconductivity in K_{3}C_{60}, while the electronic correlation effect is suggested by the observation of a waterfall-like band dispersion and the small bandwidth compared with the effective Coulomb interaction. Our results not only directly visualize the crucial band structure but also provide important insights into the mechanism of the unusual superconductivity of fulleride compounds.
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Affiliation(s)
- J S Zhou
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - R Z Xu
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - X Q Yu
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - F J Cheng
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - W X Zhao
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - X Du
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - S Z Wang
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - Q Q Zhang
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - X Gu
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - S M He
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
| | - Y D Li
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - M Q Ren
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - X C Ma
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
- Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
| | - Q K Xue
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - Y L Chen
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
- School of Physical Science and Technology, ShanghaiTech University and CAS-Shanghai Science Research Center, Shanghai 201210, China
- ShanghaiTech Laboratory for Topological Physics, Shanghai 200031, China
| | - C L Song
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
- Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
| | - L X Yang
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
- Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
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7
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Hayakawa M, Sunayama N, Takagi SI, Matsuo Y, Tamaki A, Yamaguchi S, Seki S, Fukazawa A. Flattened 1D fragments of fullerene C 60 that exhibit robustness toward multi-electron reduction. Nat Commun 2023; 14:2741. [PMID: 37188690 DOI: 10.1038/s41467-023-38300-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 04/21/2023] [Indexed: 05/17/2023] Open
Abstract
Fullerenes are compelling molecular materials owing to their exceptional robustness toward multi-electron reduction. Although scientists have attempted to address this feature by synthesizing various fragment molecules, the origin of this electron affinity remains unclear. Several structural factors have been suggested, including high symmetry, pyramidalized carbon atoms, and five-membered ring substructures. To elucidate the role of the five-membered ring substructures without the influence of high symmetry and pyramidalized carbon atoms, we herein report the synthesis and electron-accepting properties of oligo(biindenylidene)s, a flattened one-dimensional fragment of fullerene C60. Electrochemical studies corroborated that oligo(biindenylidene)s can accept electrons up to equal to the number of five-membered rings in their main chains. Moreover, ultraviolet/visible/near-infrared absorption spectroscopy revealed that oligo(biindenylidene)s exhibit enhanced absorption covering the entire visible region relative to C60. These results highlight the significance of the pentagonal substructure for attaining stability toward multi-electron reduction and provide a strategy for the molecular design of electron-accepting π-conjugated hydrocarbons even without electron-withdrawing groups.
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Affiliation(s)
- Masahiro Hayakawa
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Institute for Advanced Study, Kyoto University, Yoshida, Sakyo-ku, Kyoto, 606-8501, Japan
- Department of Chemistry, Graduate School of Science, and Integrated Research Consortium on Chemical Science (IRCCS), Nagoya University, Furo, Chikusa, Nagoya, 464-8602, Japan
| | - Naoyuki Sunayama
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Yoshida, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Shu I Takagi
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Yoshida, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Yu Matsuo
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Yoshida, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Asuka Tamaki
- Department of Chemistry, Graduate School of Science, and Integrated Research Consortium on Chemical Science (IRCCS), Nagoya University, Furo, Chikusa, Nagoya, 464-8602, Japan
| | - Shigehiro Yamaguchi
- Department of Chemistry, Graduate School of Science, and Integrated Research Consortium on Chemical Science (IRCCS), Nagoya University, Furo, Chikusa, Nagoya, 464-8602, Japan
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo, Chikusa, Nagoya, 464-8601, Japan
| | - Shu Seki
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Aiko Fukazawa
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Institute for Advanced Study, Kyoto University, Yoshida, Sakyo-ku, Kyoto, 606-8501, Japan.
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8
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Fisicaro G, Schaefer B, Finkler JA, Goedecker S. Principles of isomer stability in small clusters. MATERIALS ADVANCES 2023; 4:1746-1768. [PMID: 37026041 PMCID: PMC10068428 DOI: 10.1039/d2ma01088g] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Accepted: 02/28/2023] [Indexed: 06/19/2023]
Abstract
In this work we study isomers of several representative small clusters to find principles for their stability. Our conclusions about the principles underlying the structure of clusters are based on a huge database of 44 000 isomers generated for 58 different clusters on the density functional theory level by Minima Hopping. We explore the potential energy surface of small neutral, anionic and cationic isomers, moving left to right across the third period of the periodic table and varying the number of atoms n and the cluster charge state q (X q n , with X = {Na, Mg, Al, Si, Ge}, q = -1, 0, 1, 2). We use structural descriptors such as bond lengths and atomic coordination numbers, the surface to volume ratios and the shape factor as well as electronic descriptors such as shell filling and hardness to detect correlations with the stability of clusters. The isomers of metallic clusters are found to be structure seekers with a strong tendency to adopt compact shapes. However certain numbers of atoms can suppress the formation of nearly spherical metallic clusters. Small non-metallic clusters typically also do not adopt compact spherical shapes for their lowest energy structures. In both cases spherical jellium models are not any more applicable. Nevertheless for many structures, that frequently have a high degree of symmetry, the Kohn-Sham eigenvalues are bunched into shells and if the available electrons can completely fill such shells, a particularly stable structure can result. We call such a cluster whose shape gives rise to shells that can be completely filled by the number of available electrons an optimally matched cluster, since both the structure and the number of electrons must be special and match. In this way we can also explain the stability trends for covalent silicon and germanium cluster isomers, whose stability was previously explained by the presence of certain structural motifs. Thus we propose a unified framework to explain trends in the stability of isomers and to predict their structure for a wide range of small clusters.
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Affiliation(s)
- Giuseppe Fisicaro
- Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi (CNR-IMM), Z.I. VIII Strada 5 I-95121 Catania Italy
| | - Bastian Schaefer
- Department of Physics, University of Basel, Klingelbergstrasse 82 CH-4056 Basel Switzerland
| | - Jonas A Finkler
- Department of Physics, University of Basel, Klingelbergstrasse 82 CH-4056 Basel Switzerland
| | - Stefan Goedecker
- Department of Physics, University of Basel, Klingelbergstrasse 82 CH-4056 Basel Switzerland
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9
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Benjamin SM. Estimating the Single-Element Concentration of Intercalated Insulators for the Emergence of Superconductivity. ACS PHYSICAL CHEMISTRY AU 2022; 2:108-117. [PMID: 36855505 PMCID: PMC9718302 DOI: 10.1021/acsphyschemau.1c00027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
To predict whether a compound will superconduct and to predict its transition temperature T c prior to measurement have always been desires of the materials science community. Matthias was first to report the necessary conditions for the occurrence of superconductivity in elements, compounds, and alloys in terms of density (valence electrons per atom). This current report is motivated by somewhat similar empirical observations concerning the importance of valence electrons per unit cell; more specifically, dopant valence electrons per unit cell within intercalated insulators. In this article, though not exhaustive, a representative list of 40 superconductors will be used to show that the onset of superconductivity (insulator-superconductor boundary) within intercalated insulators can easily be modeled, almost exactly, by the ideal gas law equation. Given this observation, in contrast to Matthias, interactions are semiclassically accounted for to ultimately determine the single-element onset concentration needed to bring about superconductivity within many intercalated insulators known to date. The 13 compounds which were previously intercalated and will be discussed include inorganics, TiSe2, C60, YBa2Cu3O6, IrTe2, Bi2Se3, MoS2, ZrNCl, HfNCl, BP (black phosphorus), HoTe3, and Y2Te5, and organics, C22H14 and C14H10. In essence, the overall objective of this report is to offer a slightly different viewpoint on superconductivity, led by empirical observations, which seemingly leads to predictable experimental outcomes. If newly discovered materials further validate this approach to intercalated superconductors, with minor refinements, a route to purposefully designing superconductors may be accessible through onset conditions outlined in this article.
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Affiliation(s)
- Shermane M. Benjamin
- Physics Department, Montana
State University, Bozeman, Montana 59717-3840, United States
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10
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Heterospin frustration in a metal-fullerene-bonded semiconductive antiferromagnet. Nat Commun 2022; 13:495. [PMID: 35078998 PMCID: PMC8789904 DOI: 10.1038/s41467-022-28134-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 01/11/2022] [Indexed: 11/24/2022] Open
Abstract
Lithium-ion-encapsulated fullerenes (Li+@C60) are 3D superatoms with rich oxidative states. Here we show a conductive and magnetically frustrated metal–fullerene-bonded framework {[Cu4(Li@C60)(L)(py)4](NTf2)(hexane)}n (1) (L = 1,2,4,5-tetrakis(methanesulfonamido)benzene, py = pyridine, NTf2− = bis(trifluoromethane)sulfonamide anion) prepared from redox-active dinuclear metal complex Cu2(L)(py)4 and lithium-ion-encapsulated fullerene salt (Li+@C60)(NTf2−). Electron donor Cu2(L)(py)2 bonds to acceptor Li+@C60 via eight Cu‒C bonds. Cu–C bond formation stems from spontaneous charge transfer (CT) between Cu2(L)(py)4 and (Li+@C60)(NTf2−) by removing the two-terminal py molecules, yielding triplet ground state [Cu2(L)(py)2]+(Li+@C60•−), evidenced by absorption and electron paramagnetic resonance (EPR) spectra, magnetic properties and quantum chemical calculations. Moreover, Li+@C60•− radicals (S = ½) and Cu2+ ions (S = ½) interact antiferromagnetically in triangular spin lattices in the absence of long-range magnetic ordering to 1.8 K. The low-temperature heat capacity indicated that compound 1 is a potential candidate for an S = ½ quantum spin liquid (QSL). Conductive and magnetically frustrated solids may enable the development of high-performance molecule-based spintronic devices. Here the authors report a conductive and magnetically frustrated metal–fullerene-bonded framework prepared from a redox-active dinuclear copper complex and lithium ion-encapsulated fullerenes.
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11
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Yoshida N, Akasaka R, Awakura Y, Amaya T, Iwasawa T. Solution‐Processable Multi‐Substituted Buckybowls: Synthesis of Diindeno(1,2,3,4‐
defg
:1’,2’,3’,4’‐
mnop
)chrysene Derivatives. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100869] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Naoki Yoshida
- Department of Materials Chemistry Ryukoku University Seta, Otsu Shiga 520-2194 Japan
| | - Ryuhei Akasaka
- Department of Materials Chemistry Ryukoku University Seta, Otsu Shiga 520-2194 Japan
| | - Yusuke Awakura
- Department of Materials Chemistry Ryukoku University Seta, Otsu Shiga 520-2194 Japan
| | - Toru Amaya
- Department of Information and Basic Science Graduate School of Science Nagoya City University Mizuho-ku, Nagoya Aichi 467-8501 Japan
| | - Tetsuo Iwasawa
- Department of Materials Chemistry Ryukoku University Seta, Otsu Shiga 520-2194 Japan
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12
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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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13
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Abstract
Superconductors with exotic physical properties are critical to current and future technology. In this review, we highlight several important superconducting families and focus on their crystal structure, chemical bonding, and superconductivity correlations. We connect superconducting materials with chemical bonding interactions based on their structure-property relationships, elucidating our empirically chemical approaches and other methods used in the discovery of new superconductors. Furthermore, we provide some technical strategies to synthesize superconductors and basic but important characterization for chemists needed when reporting new superconductors. In the end, we share our thoughts on how to make new superconductors and where chemists can work on in the superconductivity field. This review is written using chemical terms, with a focus on providing some chemically intuitive thoughts on superconducting materials design.
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Affiliation(s)
- Xin Gui
- Department of Chemistry, Princeton University, Princeton, New Jersey 08540, United States
| | - Bing Lv
- Department of Physics, University of Texas at Dallas, Richardson, Texas 75080, United States.,Department of Materials Science & Engineering, University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Weiwei Xie
- Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, New Jersey 08854, United States
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14
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Gadjieva NA, Szirmai P, Sági O, Alemany P, Bartholomew AK, Stone I, Conejeros S, Paley DW, Hernández Sánchez R, Fowler B, Peurifoy SR, Náfrádi B, Forró L, Roy X, Batail P, Canadell E, Steigerwald ML, Nuckolls C. Intermolecular Resonance Correlates Electron Pairs Down a Supermolecular Chain: Antiferromagnetism in K-Doped p-Terphenyl. J Am Chem Soc 2020; 142:20624-20630. [PMID: 33236891 DOI: 10.1021/jacs.0c05606] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Recent interest in potassium-doped p-terphenyl has been fueled by reports of superconductivity at Tc values surprisingly high for organic compounds. Despite these interesting properties, studies of the structure-function relationships within these materials have been scarce. Here, we isolate a phase-pure crystal of potassium-doped p-terphenyl: [K(222)]2[p-terphenyl3]. Emerging antiferromagnetism in the anisotropic structure is studied in depth by magnetometry and electron spin resonance. Combining these experimental results with density functional theory calculations, we describe the antiferromagnetic coupling in this system that occurs in all 3 crystallographic directions. The strongest coupling was found along the ends of the terphenyls, where the additional electron on neighboring p-terphenyls antiferromagnetically couple. This delocalized bonding interaction is reminiscent of the doubly degenerate resonance structure depiction of polyacetylene. These findings hint toward magnetic fluctuation-induced superconductivity in potassium-doped p-terphenyl, which has a close analogy with high Tc cuprate superconductors. The new approach described here is very versatile as shown by the preparation of two additional salts through systematic changing of the building blocks.
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Affiliation(s)
- Natalia A Gadjieva
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | | | | | - Pere Alemany
- Departament de Ciència de Materials i Química Física and Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, Martí i Franquès 1, Barcelona 08028, Spain
| | | | - Ilana Stone
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Sergio Conejeros
- Departamento de Química, Universidad Católica del Norte, Avenida Angamos 0610, Antofagasta 124000, Chile
| | - Daniel W Paley
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Raúl Hernández Sánchez
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, United States
| | - Brandon Fowler
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Samuel R Peurifoy
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | | | | | - Xavier Roy
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Patrick Batail
- Department of Chemistry, Columbia University, New York, New York 10027, United States.,MOLTECH-Anjou, UMR 6200, CNRS, Universite d'Angers, 49045 Angers, France
| | - Enric Canadell
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, Bellaterra 08193, Spain
| | - Michael L Steigerwald
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Colin Nuckolls
- Department of Chemistry, Columbia University, New York, New York 10027, United States
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15
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Zhang J, Ding F, Lee JJ, Shan G, Bobev S. One Structure, Two Elements-LuGe 2 Superconductor vs Ordinary Metallic Conductor LuSn 2. A Case Study on How Site-Selective Germanium for Tin Atom Substitution Leads to Modulating of the Charge Distribution. Inorg Chem 2020; 59:16853-16864. [PMID: 32970413 DOI: 10.1021/acs.inorgchem.0c01062] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The substitution of chemically similar elements in a given crystal structure is an effective way to enhance physical properties, but the understanding on such improvements is usually impeded because the substitutions are random, and the roles of the different atoms cannot be distinguished by crystallographic symmetry. Herein, we provide a detailed crystallographic analysis and property measurements for the continuous solid solutions LuGexSn2-x (0 < x < 2). The results show that there is no apparent change of the global symmetry, with the end-members LuGe2 and LuSn2, as well as the intermediate LuGexSn2-x compositions adopting the ZrSi2 type structure (space group Cmcm, Pearson index oC12). Yet, the refinements of the crystal structures from single-crystal X-ray diffraction data show that Ge-Sn atom substitutions are not random, but occur preferentially at the zigzag chain. The patterned distribution of two group 14 elements leads to a significant variation in chemical bonding and charge ordering within the other structural fragment, the 2D square nets, thereby resulting in tuned electron transport. The enhancement is greater than that for the typical Bloch-Gruneisen model and more akin to that for the parallel-resistor model. Magnetization measurements on single crystals show bulk superconductivity in all LuGexSn2-x samples with shielding fractions as high as 90%. Specific heat data confirm the effect to originate from residual metallic tin in the material, indicating that Sn atom substitutions in the 2D square nets cause disruptions of the hypervalent bonding and local anisotropy, which ultimately leads to vanishing of the superconducting state in the end-member LuGe2. This work sheds light on how the complexity in chemical interactions by two different carbon congeners leads to changes in the physical properties and how they can be correlated with the induced charge distribution. These studies also provide a general approach to modulation of charge density and. thus, of emerging physical properties in other classes of intermetallic systems based on the main-group elements of groups 13 to 15.
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Affiliation(s)
- Jiliang Zhang
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States.,Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea
| | - Fazhu Ding
- Key Laboratory of Applied Superconductivity and Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.,University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Jey-Jau Lee
- National Synchrotron Radiation Research Center, Hsinchu 30076 Taiwan, Republic of China
| | - Guangcun Shan
- School of Instrument Science and Optoelectronics Engineering & Institute of Precision Mechanics and Quantum Sensing, Beihang University, Beijing 100083, People's Republic of China.,Institute of Experimental Physics, Saarland University, 66123 Saarbrücken, Germany
| | - Svilen Bobev
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
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16
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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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17
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Ren MQ, Han S, Wang SZ, Fan JQ, Song CL, Ma XC, Xue QK. Direct Observation of Full-Gap Superconductivity and Pseudogap in Two-Dimensional Fullerides. PHYSICAL REVIEW LETTERS 2020; 124:187001. [PMID: 32441977 DOI: 10.1103/physrevlett.124.187001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Accepted: 04/15/2020] [Indexed: 06/11/2023]
Abstract
Alkali-fulleride superconductors with a maximum critical temperature T_{c}∼40 K exhibit a similar electronic phase diagram to that of unconventional high-T_{c} superconductors. Here we employ cryogenic scanning tunneling microscopy to show that trilayer K_{3}C_{60} displays fully gapped strong coupling s-wave superconductivity, accompanied by a pseudogap above T_{c}∼22 K and within vortices. A precise control of the electronic correlations and potassium doping enables us to reveal that superconductivity occurs near a superconductor-Mott-insulator transition and reaches maximum at half-filling. The s-wave symmetry retains over the entire phase diagram, which, in conjunction with an abrupt decline of the superconductivity below half-filling, indicates that alkali fullerides are predominantly phonon-mediated superconductors, although the electronic correlations also come into play.
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Affiliation(s)
- Ming-Qiang Ren
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
| | - Sha Han
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
| | - Shu-Ze Wang
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
| | - Jia-Qi Fan
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
| | - Can-Li Song
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - Xu-Cun Ma
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
| | - Qi-Kun Xue
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
- Frontier Science Center for Quantum Information, Beijing 100084, China
- Beijing Academy of Quantum Information Sciences, Beijing 100193, China
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18
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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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19
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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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20
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Cui X, Han D, Guo H, Zhou L, Qiao J, Liu Q, Cui Z, Li Y, Lin C, Cao L, Ji W, Petek H, Feng M. Realizing nearly-free-electron like conduction band in a molecular film through mediating intermolecular van der Waals interactions. Nat Commun 2019; 10:3374. [PMID: 31358744 PMCID: PMC6662711 DOI: 10.1038/s41467-019-11300-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 07/01/2019] [Indexed: 12/03/2022] Open
Abstract
Collective molecular physical properties can be enhanced from their intrinsic characteristics by templating at material interfaces. Here we report how a black phosphorous (BP) substrate concatenates a nearly-free-electron (NFE) like conduction band of a C60 monolayer. Scanning tunneling microscopy reveals the C60 lowest unoccupied molecular orbital (LUMO) band is strongly delocalized in two-dimensions, which is unprecedented for a molecular semiconductor. Experiment and theory show van der Waals forces between C60 and BP reduce the inter-C60 distance and cause mutual orientation, thereby optimizing the π-π wave function overlap and forming the NFE-like band. Electronic structure and carrier mobility calculations predict that the NFE band of C60 acquires an effective mass of 0.53-0.70 me (me is the mass of free electrons), and has carrier mobility of ~200 to 440 cm2V-1s-1. The substrate-mediated intermolecular van der Waals interactions provide a route to enhance charge delocalization in fullerenes and other organic semiconductors.
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Affiliation(s)
- Xingxia Cui
- School of Physics and Technology and Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan, 430072, China
| | - Ding Han
- School of Physics and Technology and Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan, 430072, China
| | - Hongli Guo
- School of Physics and Technology and Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan, 430072, China
| | - Linwei Zhou
- Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-Nano Devices, Department of Physics, Renmin University of China, Beijing, 100872, China
| | - Jingsi Qiao
- Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-Nano Devices, Department of Physics, Renmin University of China, Beijing, 100872, China
| | - Qing Liu
- School of Physics and Technology and Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan, 430072, China
| | - Zhihao Cui
- School of Physics and Technology and Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan, 430072, China
| | - Yafei Li
- School of Physics and Technology and Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan, 430072, China
| | - Chungwei Lin
- Mitsubishi Electric Research Laboratories, 201 Broadway, Cambridge, MA, 02139, USA
| | - Limin Cao
- School of Physics and Technology and Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan, 430072, China
| | - Wei Ji
- Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-Nano Devices, Department of Physics, Renmin University of China, Beijing, 100872, China.
| | - Hrvoje Petek
- Department of Physics and Astronomy and Pittsburgh Quantum Institute, University of Pittsburgh, Pittsburgh, PA, 15260, USA.
| | - Min Feng
- School of Physics and Technology and Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, Wuhan University, Wuhan, 430072, China.
- Institute for Advanced Studies, Wuhan University, Wuhan, 430072, China.
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21
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Lv H, Chen M, Feng Y, Li W, Zhong G, Yang C. Superconductivity of light‐metal hydrides. J CHIN CHEM SOC-TAIP 2019. [DOI: 10.1002/jccs.201800453] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hai‐Yan Lv
- Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences Shenzhen P. R. China
- Nano Science and Technology InstituteUniversity of Science and Technology of China Suzhou P. R. China
| | - Ming Chen
- Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences Shenzhen P. R. China
| | - Ye Feng
- Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences Shenzhen P. R. China
| | - Wen‐Jie Li
- Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences Shenzhen P. R. China
| | - Guo‐Hua Zhong
- Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences Shenzhen P. R. China
| | - Chun‐Lei Yang
- Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences Shenzhen P. R. China
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22
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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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23
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Crystal Orbital Study on one-dimensional β-graphyne and its BN-substituted derivatives. J SOLID STATE CHEM 2018. [DOI: 10.1016/j.jssc.2018.06.029] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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24
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Zhong GH, Yang CL, Chen XJ, Lin HQ. Superconductivity in solid benzene molecular crystal. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:245703. [PMID: 29749961 DOI: 10.1088/1361-648x/aac3ff] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Light-element compounds hold great promise of high critical temperature superconductivity judging from the theoretical perspective. A hydrogen-rich material, benzene, is such a kind of candidate but also an organic compound. A series of first-principles calculations are performed on the electronic structures, dynamics properties, and electron-phonon interactions of solid benzene at high pressures. Benzene is found to be dynamically stable in the pressure range of 180-200 GPa and to exhibit superconductivity with a maximum transition temperature of 20 K at 195 GPa. The phonon modes of carbon atoms are identified to mainly contribute to the electron-phonon interactions driving this superconductivity. The predicted superconductivity in this simplest pristine hydrocarbon shows a common feature in aromatic hydrocarbons and also makes it a bridge to organic and hydrogen-rich superconductors.
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Affiliation(s)
- Guo-Hua Zhong
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, People's Republic of China
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25
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Yu F, Li J, Cao ZH, Kurmoo M, Zuo JL. Electrical Conductivity of Copper Hexamers Tuned by their Ground-State Valences. Inorg Chem 2018. [PMID: 29517912 DOI: 10.1021/acs.inorgchem.8b00243] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new design concept has been realized for the construction of molecular conductors, whereby the building unit contains a core reservoir of carriers made up of metal ions with controllable valence states and shelled by flat organic ligands having an extended π-system to promote supramolecular electronic communication. Therefore, reacting the conjugated multidentate ligand 5,5'-pyridyl-3,3'-bi-1 H-pyrazole with different copper salts solvothermally led to three interesting hexameric salts having different ground-state valences, [CuII6(L)4(NO3)(CH3OH)2](NO3)3·4CH3OH, [(CH3)2NH2][CuICuII5(L)4](SO4)2·4H2O, and [CuI2CuII4(L)4](NO3)2·2CH3OH. The monovalent CuII6 salt is an insulator, but the mixed-valent CuII5-CuI and CuII4-CuI2 salts are semiconductors. Magnetic exchange interactions up to JNN = -158 cm-1 dominate the susceptibilities and lead to ground-state spin ST = 1 (CuII6), 1/2 (CuII5-CuI), and 0 (CuII4-CuI2) at 40 K. Cyclic voltammetry shows the stepwise one-electron oxidation-reduction through all the possible valence states. The theoretical calculations of the electronic and band structures of the three compounds substantiate the experimentally observed physical properties.
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Affiliation(s)
- Fei Yu
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures , Nanjing University , Nanjing 210023 , P. R. China
| | - Jing Li
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures , Nanjing University , Nanjing 210023 , P. R. China
| | - Zi-Heng Cao
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures , Nanjing University , Nanjing 210023 , P. R. China
| | - Mohamedally Kurmoo
- Institut de Chimie de Strasbourg , Université de Strasbourg, CNRS-UMR 7177 , 4 rue Blaise Pascal , 67008 Strasbourg , France
| | - Jing-Lin Zuo
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures , Nanjing University , Nanjing 210023 , P. R. China
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Wang Y, Díaz-Tendero S, Alcamí M, Martín F. Topology-Based Approach to Predict Relative Stabilities of Charged and Functionalized Fullerenes. J Chem Theory Comput 2018; 14:1791-1810. [DOI: 10.1021/acs.jctc.7b01048] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yang Wang
- Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Sergio Díaz-Tendero
- Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Manuel Alcamí
- Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), 28049 Madrid, Spain
| | - Fernando Martín
- Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), 28049 Madrid, Spain
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28
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Nakayama R, Maesato M, Yamamoto T, Kageyama H, Terashima T, Kitagawa H. Heavy interstitial hydrogen doping into SrTiO3. Chem Commun (Camb) 2018; 54:12439-12442. [DOI: 10.1039/c8cc07021k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We first report the heavy interstitial hydrogen doping and metallization of otherwise highly insulating SrTiO3by hydrogen ion beam irradiation.
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Affiliation(s)
- Ryo Nakayama
- Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho
- Kyoto 606-8502
- Japan
| | - Mitsuhiko Maesato
- Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho
- Kyoto 606-8502
- Japan
| | - Takafumi Yamamoto
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University
- Kyoto 615-851
- Japan
| | - Hiroshi Kageyama
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University
- Kyoto 615-851
- Japan
| | - Takahito Terashima
- Division of Physics and Astronomy, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho
- Kyoto 606-8502
- Japan
| | - Hiroshi Kitagawa
- Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho
- Kyoto 606-8502
- Japan
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29
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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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30
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Ran C, Xu J, Gao W, Huang C, Dou S. Defects in metal triiodide perovskite materials towards high-performance solar cells: origin, impact, characterization, and engineering. Chem Soc Rev 2018; 47:4581-4610. [DOI: 10.1039/c7cs00868f] [Citation(s) in RCA: 320] [Impact Index Per Article: 53.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The progress of defect science in metal triiodide perovskite is critically reviewed, including the origin, impacts, characterization, and engineering.
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Affiliation(s)
- Chenxin Ran
- Shaanxi Key Lab of Information Photonic Technique
- School of Electronic and Information Engineering
- Xi’ an Jiaotong University
- Xi’an 710049
- China
| | - Jiantie Xu
- School of Environment and Energy
- Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control
- National Engineering Laboratory for VOCs Pollution Control Technology and Equipment
- South China University of Technology
- Guangzhou 510640
| | - Weiyin Gao
- Shaanxi Key Lab of Information Photonic Technique
- School of Electronic and Information Engineering
- Xi’ an Jiaotong University
- Xi’an 710049
- China
| | - Chunmao Huang
- School of Environment and Energy
- Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control
- National Engineering Laboratory for VOCs Pollution Control Technology and Equipment
- South China University of Technology
- Guangzhou 510640
| | - Shixue Dou
- Institute for Superconducting and Electronic Materials
- University of Wollongong
- Wollongong 2500
- Australia
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31
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Huang X, Zhang S, Liu L, Yu L, Chen G, Xu W, Zhu D. Superconductivity in a Copper(II)-Based Coordination Polymer with Perfect Kagome Structure. Angew Chem Int Ed Engl 2017; 57:146-150. [DOI: 10.1002/anie.201707568] [Citation(s) in RCA: 176] [Impact Index Per Article: 25.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 09/24/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Xing Huang
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Organic Solids; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - Shuai Zhang
- Beijing National Laboratory for Condensed Matter Physics; Institute of Physics; Chinese Academy of Sciences; P.O. Box 603 Beijing 100190 China
| | - Liyao Liu
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Organic Solids; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - Lei Yu
- Department of Chemistry; University of Kentucky; Lexington KY 40506 USA
| | - Genfu Chen
- Beijing National Laboratory for Condensed Matter Physics; Institute of Physics; Chinese Academy of Sciences; P.O. Box 603 Beijing 100190 China
- University of Chinese Academy of Sciences; Beijing 100049 China
- Collaborative Innovation Center of Quantum Matter; Beijing 100190 China
| | - Wei Xu
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Organic Solids; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - Daoben Zhu
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Organic Solids; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
- University of Chinese Academy of Sciences; Beijing 100049 China
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32
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Huang X, Zhang S, Liu L, Yu L, Chen G, Xu W, Zhu D. Superconductivity in a Copper(II)-Based Coordination Polymer with Perfect Kagome Structure. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201707568] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xing Huang
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Organic Solids; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - Shuai Zhang
- Beijing National Laboratory for Condensed Matter Physics; Institute of Physics; Chinese Academy of Sciences; P.O. Box 603 Beijing 100190 China
| | - Liyao Liu
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Organic Solids; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - Lei Yu
- Department of Chemistry; University of Kentucky; Lexington KY 40506 USA
| | - Genfu Chen
- Beijing National Laboratory for Condensed Matter Physics; Institute of Physics; Chinese Academy of Sciences; P.O. Box 603 Beijing 100190 China
- University of Chinese Academy of Sciences; Beijing 100049 China
- Collaborative Innovation Center of Quantum Matter; Beijing 100190 China
| | - Wei Xu
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Organic Solids; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - Daoben Zhu
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Organic Solids; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
- University of Chinese Academy of Sciences; Beijing 100049 China
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33
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Arita R, Koretsune T, Sakai S, Akashi R, Nomura Y, Sano W. Nonempirical Calculation of Superconducting Transition Temperatures in Light-Element Superconductors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29. [PMID: 28060417 DOI: 10.1002/adma.201602421] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 08/05/2016] [Indexed: 02/05/2023]
Abstract
Recent progress in the fully nonempirical calculation of the superconducting transition temperature (Tc ) is reviewed. Especially, this study focuses on three representative light-element high-Tc superconductors, i.e., elemental Li, sulfur hydrides, and alkali-doped fullerides. Here, it is discussed how crucial it is to develop the beyond Migdal-Eliashberg (ME) methods. For Li, a scheme of superconducting density functional theory for the plasmon mechanism is formulated and it is found that Tc is dramatically enhanced by considering the frequency dependence of the screened Coulomb interaction. For sulfur hydrides, it is essential to go beyond not only the static approximation for the screened Coulomb interaction, but also the constant density-of-states approximation for electrons, the harmonic approximation for phonons, and the Migdal approximation for the electron-phonon vertex, all of which have been employed in the standard ME calculation. It is also shown that the feedback effect in the self-consistent calculation of the self-energy and the zero point motion considerably affect the calculation of Tc . For alkali-doped fullerides, the interplay between electron-phonon coupling and electron correlations becomes more nontrivial. It has been demonstrated that the combination of density functional theory and dynamical mean field theory with the ab initio downfolding scheme for electron-phonon coupled systems works successfully. This study not only reproduces the experimental phase diagram but also obtains a unified view of the high-Tc superconductivity and the Mott-Hubbard transition in the fullerides. The results for these high-Tc superconductors will provide a firm ground for future materials design of new superconductors.
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Affiliation(s)
- Ryotaro Arita
- RIKEN Center for Emergent Matter Science, Wako, Saitama, 351-0198, Japan
- JST ERATO Isobe Degenerate π-Integration Project, Advanced Institute for Materials Research, Tohoku University, Katahira, Aoba-ku, Sendai, 980-8577, Japan
| | - Takashi Koretsune
- RIKEN Center for Emergent Matter Science, Wako, Saitama, 351-0198, Japan
- JST-PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan
| | - Shiro Sakai
- RIKEN Center for Emergent Matter Science, Wako, Saitama, 351-0198, Japan
| | - Ryosuke Akashi
- Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Yusuke Nomura
- Centre de Physique Théorique, École Polytechnique, CNRS, Université Paris-Saclay, F-91128, Palaiseau, France
| | - Wataru Sano
- RIKEN Center for Emergent Matter Science, Wako, Saitama, 351-0198, Japan
- Department of Applied Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
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34
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Romero FD, Pitcher MJ, Hiley CI, Whitehead GFS, Kar S, Ganin AY, Antypov D, Collins C, Dyer MS, Klupp G, Colman RH, Prassides K, Rosseinsky MJ. Redox-controlled potassium intercalation into two polyaromatic hydrocarbon solids. Nat Chem 2017. [PMID: 28644481 DOI: 10.1038/nchem.2765] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Alkali metal intercalation into polyaromatic hydrocarbons (PAHs) has been studied intensely after reports of superconductivity in a number of potassium- and rubidium-intercalated materials. There are, however, no reported crystal structures to inform our understanding of the chemistry and physics because of the complex reactivity of PAHs with strong reducing agents at high temperature. Here we present the synthesis of crystalline K2Pentacene and K2Picene by a solid-solid insertion protocol that uses potassium hydride as a redox-controlled reducing agent to access the PAH dianions, and so enables the determination of their crystal structures. In both cases, the inserted cations expand the parent herringbone packings by reorienting the molecular anions to create multiple potassium sites within initially dense molecular layers, and thus interact with the PAH anion π systems. The synthetic and crystal chemistry of alkali metal intercalation into PAHs differs from that into fullerenes and graphite, in which the cation sites are pre-defined by the host structure.
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Affiliation(s)
- F Denis Romero
- Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, UK
| | - M J Pitcher
- Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, UK
| | - C I Hiley
- Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, UK
| | - G F S Whitehead
- Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, UK
| | - S Kar
- Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, UK
| | - A Y Ganin
- Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, UK
| | - D Antypov
- Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, UK
| | - C Collins
- Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, UK
| | - M S Dyer
- Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, UK
| | - G Klupp
- Department of Chemistry, Durham University, Lower Mountjoy, South Road, Durham DH1 3LE, UK
| | - R H Colman
- Department of Chemistry, Durham University, Lower Mountjoy, South Road, Durham DH1 3LE, UK
| | - K Prassides
- WPI-AIMR, Tohoku University, 2-2-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.,Japan Science and Technology Agency, ERATO Isobe Degenerate π-Integration Project, Tohoku University, Sendai 980-8577, Japan
| | - M J Rosseinsky
- Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, UK
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Renzler M, Kranabetter L, Goulart M, Scheier P, Echt O. Positively and Negatively Charged Cesium and (C 60) m Cs n Cluster Ions. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2017; 121:10817-10823. [PMID: 28572870 PMCID: PMC5447244 DOI: 10.1021/acs.jpcc.6b11928] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2016] [Revised: 12/22/2016] [Indexed: 05/29/2023]
Abstract
We report on the formation and ionization of cesium and C60Cs clusters in superfluid helium nanodroplets. Size distributions of positively and negatively charged (C60) m Cs n± ions have been measured for m ≤ 7, n ≤ 12. Reproducible intensity anomalies are observed in high-resolution mass spectra. For both charge states, (C60) m Cs3± and (C60) m Cs5± are particularly abundant, with little dependence on the value of m. Distributions of bare cesium cluster ions also indicate enhanced stability of Cs3± and Cs5±, in agreement with theoretical predictions. These findings contrast with earlier reports on highly Cs-doped cationic fullerene aggregates which showed enhanced stability of C60Cs6 building blocks attributed to charge transfer. The dependence of the (C60) m Cs3- anion yield on electron energy shows a resonance that, surprisingly, oscillates in strength as m increases from 1 to 6.
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Affiliation(s)
- Michael Renzler
- Institut
für Ionenphysik und Angewandte Physik, University of Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria
| | - Lorenz Kranabetter
- Institut
für Ionenphysik und Angewandte Physik, University of Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria
| | - Marcelo Goulart
- Institut
für Ionenphysik und Angewandte Physik, University of Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria
| | - Paul Scheier
- Institut
für Ionenphysik und Angewandte Physik, University of Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria
| | - Olof Echt
- Institut
für Ionenphysik und Angewandte Physik, University of Innsbruck, Technikerstrasse 25, A-6020 Innsbruck, Austria
- Department
of Physics, University of New Hampshire, Durham, New Hampshire 03824, United States
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Ko Y, Kim J, Kim D, Yamauchi Y, Kim JH, You J. A Simple Silver Nanowire Patterning Method Based on Poly(Ethylene Glycol) Photolithography and Its Application for Soft Electronics. Sci Rep 2017; 7:2282. [PMID: 28536475 PMCID: PMC5442115 DOI: 10.1038/s41598-017-02511-8] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Accepted: 04/12/2017] [Indexed: 11/26/2022] Open
Abstract
Hydrogel-based flexible microelectrodes have garnered considerable attention recently for soft bioelectronic applications. We constructed silver nanowire (AgNW) micropatterns on various substrates, via a simple, cost-effective, and eco-friendly method without aggressive etching or lift-off processes. Polyethylene glycol (PEG) photolithography was employed to construct AgNW patterns with various shapes and sizes on the glass substrate. Based on a second hydrogel gelation process, AgNW patterns on glass substrate were directly transferred to the synthetic/natural hydrogel substrates. The resultant AgNW micropatterns on the hydrogel exhibited high conductivity (ca. 8.40 × 103 S cm-1) with low sheet resistance (7.51 ± 1.11 Ω/sq), excellent bending durability (increases in resistance of only ~3 and ~13% after 40 and 160 bending cycles, respectively), and good stability in wet conditions (an increase in resistance of only ~6% after 4 h). Considering both biocompatibility of hydrogel and high conductivity of AgNWs, we anticipate that the AgNW micropatterned hydrogels described here will be particularly valuable as highly efficient and mechanically stable microelectrodes for the development of next-generation bioelectronic devices, especially for implantable biomedical devices.
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Affiliation(s)
- Youngsang Ko
- Department of Plant & Environmental New Resources, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do, 446-701, South Korea
| | - Jeonghun Kim
- Institute for Superconducting and Electronic Materials (ISEM), Australian Institute for Innovative Materials (AIIM), University of Wollongong, North Wollongong, NSW 2500, Australia
| | - Dabum Kim
- Department of Plant & Environmental New Resources, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do, 446-701, South Korea
| | - Yusuke Yamauchi
- Institute for Superconducting and Electronic Materials (ISEM), Australian Institute for Innovative Materials (AIIM), University of Wollongong, North Wollongong, NSW 2500, Australia
| | - Jung Ho Kim
- Institute for Superconducting and Electronic Materials (ISEM), Australian Institute for Innovative Materials (AIIM), University of Wollongong, North Wollongong, NSW 2500, Australia.
| | - Jungmok You
- Department of Plant & Environmental New Resources, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do, 446-701, South Korea.
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Takabayashi Y, Menelaou M, Tamura H, Takemori N, Koretsune T, Štefančič A, Klupp G, Buurma AJC, Nomura Y, Arita R, Arčon D, Rosseinsky MJ, Prassides K. π-electron S = ½ quantum spin-liquid state in an ionic polyaromatic hydrocarbon. Nat Chem 2017. [DOI: 10.1038/nchem.2764] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Harshman DR, Fiory AT. High-T C superconductivity in Cs 3C 60 compounds governed by local Cs-C 60 Coulomb interactions. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:145602. [PMID: 28151430 DOI: 10.1088/1361-648x/aa5dbd] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Unique among alkali-doped A 3C60 fullerene compounds, the A15 and fcc forms of Cs3C60 exhibit superconducting states varying under hydrostatic pressure with highest transition temperatures at [Formula: see text] = 38.3 and 35.2 K, respectively. Herein it is argued that these two compounds under pressure represent the optimal materials of the A 3C60 family, and that the C60-associated superconductivity is mediated through Coulombic interactions with charges on the alkalis. A derivation of the interlayer Coulombic pairing model of high-T C superconductivity employing non-planar geometry is introduced, generalizing the picture of two interacting layers to an interaction between charge reservoirs located on the C60 and alkali ions. The optimal transition temperature follows the algebraic expression, T C0 = (12.474 nm2 K)/ℓζ, where ℓ relates to the mean spacing between interacting surface charges on the C60 and ζ is the average radial distance between the C60 surface and the neighboring Cs ions. Values of T C0 for the measured cation stoichiometries of Cs3-x C60 with x ≈ 0 are found to be 38.19 and 36.88 K for the A15 and fcc forms, respectively, with the dichotomy in transition temperature reflecting the larger ζ and structural disorder in the fcc form. In the A15 form, modeled interacting charges and Coulomb potential e2/ζ are shown to agree quantitatively with findings from nuclear-spin relaxation and mid-infrared optical conductivity. In the fcc form, suppression of [Formula: see text] below T C0 is ascribed to native structural disorder. Phononic effects in conjunction with Coulombic pairing are discussed.
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Affiliation(s)
- Dale R Harshman
- Department of Physics, The College of William and Mary, Williamsburg, VA 23187, United States of America
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Lavrentiev V, Stupakov A, Lavrentieva I, Motylenko M, Barchuk M, Rafaja D. Evidence of interface exchange magnetism in self-assembled cobalt-fullerene nanocomposites exposed to air. NANOTECHNOLOGY 2017; 28:125704. [PMID: 28145895 DOI: 10.1088/1361-6528/aa5d73] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report on the establishing of an exclusive magnetic effect in air-exposed CoxC60 nanocomposites (x > 2) created through self-assembling in the depositing mixture. In order to verify the influence of ambient air on the CoxC60 mixture film, we have studied in detail the film magnetization at rather low temperatures, which provides their ferromagnetic behavior. Tracing the possible exchange bias effect, we distinguished a clear vertical shift of the hysteresis loops recorded for the air-exposed CoxC60 films in the field cooling (FC) regime. The detected vertical shift of the FC loops is caused by an uncompensated magnetic moment M u induced by exchange coupling of the Co spins at the Co/CoO interface. This interface arises due to the oxidation of small Co clusters distributed in a C60-based matrix of self-assembled composite films, which occurs during air exposure. The core-shell structure of the Co/CoO magnetic clusters (about 2-3 nm in size) consisting of a ε-Co core and fcc-CoO shell was confirmed by means of transmission electron microscopy. Established interface magnetism testifies to a composite nanostructure in the CoxC60 mixture film with x > 2 and explains the influence of air exposure on the film structure. The discovered magnetic effect implies a new application potential for cobalt-fullerene composites in sensors and catalysis.
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Affiliation(s)
- V Lavrentiev
- Nuclear Physics Institute CAS, Rez-130, Husinec 25068, Czechia
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Upper critical field reaches 90 tesla near the Mott transition in fulleride superconductors. Nat Commun 2017; 8:14467. [PMID: 28211544 PMCID: PMC5321754 DOI: 10.1038/ncomms14467] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Accepted: 01/03/2017] [Indexed: 01/23/2023] Open
Abstract
Controlled access to the border of the Mott insulating state by variation of control parameters offers exotic electronic states such as anomalous and possibly high-transition-temperature (Tc) superconductivity. The alkali-doped fullerides show a transition from a Mott insulator to a superconductor for the first time in three-dimensional materials, but the impact of dimensionality and electron correlation on superconducting properties has remained unclear. Here we show that, near the Mott insulating phase, the upper critical field Hc2 of the fulleride superconductors reaches values as high as ∼90 T—the highest among cubic crystals. This is accompanied by a crossover from weak- to strong-coupling superconductivity and appears upon entering the metallic state with the dynamical Jahn–Teller effect as the Mott transition is approached. These results suggest that the cooperative interplay between molecular electronic structure and strong electron correlations plays a key role in realizing robust superconductivity with high-Tc and high-Hc2. Alkali-doped fullerides are superconductors but the impact of dimensionality and electron correlation remains unclear. Here, Kasahara et al. report an upper critical field about 90 T, suggesting cooperative interplay between molecular electronic structure and strong electron correlations.
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Wakita T, Okazaki H, Jabuchi T, Hamada H, Muraoka Y, Yokoya T. Electronic structure of K-doped picene film on HOPG. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:064001. [PMID: 28002037 DOI: 10.1088/1361-648x/29/6/064001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We have performed potassium (K)-doping dependent photoemission (PES) measurements of picene film on highly oriented pyrolytic graphite (HOPG). K-doping dependent valence band PES data exhibits a shift of the valence band to a higher binding energy, indicative of the charge transfer from the K atoms to the picene film. K-doping dependent PES spectra near the Fermi level (E F) show the appearance and disappearance of a Fermi edge, indicating the metallic properties of the film at certain K concentrations. High-resolution PES spectrum at the lowest measured temperature does not show an opening of the superconducting gap, requesting further studies to explore the superconducting properties of the K-doped picene film. The results will be discussed by comparison with previous and recent spectroscopic studies.
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Affiliation(s)
- T Wakita
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
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Zhong GH, Zhang C, Yan X, Li X, Du Z, Jing G, Ma C. Structural and electronic properties of potassium-doped 1,2;8,9-dibenzopentacene superconductor: comparing with doped [7]phenacenes. Mol Phys 2017. [DOI: 10.1080/00268976.2016.1274439] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Guo-Hua Zhong
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences , Shenzhen, P.R. China
| | - Chao Zhang
- Department of Physics, Yantai University , Yantai, P.R. China
| | - Xunwang Yan
- School of physics and electrical engineering, Anyang Normal University , Henan, P.R. China
| | - Xiaoguang Li
- Institute for Advanced Study, Shenzhen University , Shenzhen, P.R. China
| | - Zheng Du
- National Supercomputing Center in Shenzhen , Shenzhen, P.R. China
| | - Gexin Jing
- National Supercomputing Center in Shenzhen , Shenzhen, P.R. China
| | - Cencen Ma
- Shenzhen Energy Guangming Gas Turbine Power Plant Construction Planning and Development Office , Shenzhen, P.R. China
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Spisak SN, Wei Z, Petrukhina MA. Mixing Li and Cs in the reduction of corannulene for the assembly of a cesium-capped sandwich with a hexanuclear heterometallic core. Dalton Trans 2017; 46:5625-5630. [DOI: 10.1039/c6dt04521a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
In the first Li/Cs organometallic self-assembly, the tetrareduced corannulene decks are angled up to keep the highly-charged (Li3Cs3)6+ unit in between, with two external Cs+ ions capping the sandwich from outside.
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Affiliation(s)
- Sarah N. Spisak
- Department of Chemistry
- University at Albany
- State University of New York
- Albany
- USA
| | - Zheng Wei
- Department of Chemistry
- University at Albany
- State University of New York
- Albany
- USA
| | - Marina A. Petrukhina
- Department of Chemistry
- University at Albany
- State University of New York
- Albany
- USA
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Nakagawa T, Yuan Z, Zhang J, Yusenko KV, Drathen C, Liu Q, Margadonna S, Jin C. Structure and magnetic property of potassium intercalated pentacene: observation of superconducting phase in K x C 22H 14. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:484001. [PMID: 27666117 DOI: 10.1088/0953-8984/28/48/484001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report the results from systematic investigations on the structure and magnetic properties of potassium intercalated pentacene as a function of potassium content, K x C22H14 (1 ⩽ x ⩽ 3). Synchrotron radiation powder x-ray diffraction technique revealed that there are two different stable phases can be obtained via potassium intercalation, namely, K1C22H14 phase and K3C22H14 phase. Structural phase transition was induced when the potassium content was increased to the nominal value x = 3. This phase transition is accompanied by drastic change in their magnetic property, where those samples with compositions K1C22H14 shows ferromagnetic behavior and those with near K3C22H14 lead to observation of superconductivity with transition temperature, T c, of 4.5 K. It is first time that superconductivity was observed in linear oligoacenes. Both magnetization study and synchrotron radiation powder x-ray diffraction clearly indicates that the superconducting phase belong to K3C22H14 as a result of phase transition from triclinic to monoclinic structure induced by chemical doping.
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Affiliation(s)
- Takeshi Nakagawa
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
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Mito M, Matsui H, Tsuruta K, Yamaguchi T, Nakamura K, Deguchi H, Shirakawa N, Adachi H, Yamasaki T, Iwaoka H, Ikoma Y, Horita Z. Large enhancement of superconducting transition temperature in single-element superconducting rhenium by shear strain. Sci Rep 2016; 6:36337. [PMID: 27811983 PMCID: PMC5095657 DOI: 10.1038/srep36337] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Accepted: 10/13/2016] [Indexed: 11/21/2022] Open
Abstract
Finding a physical approach for increasing the superconducting transition temperature (Tc) is a challenge in the field of material science. Shear strain effects on the superconductivity of rhenium were investigated using magnetic measurements, X-ray diffraction, transmission electron microscopy, and first-principles calculations. A large shear strain reduces the grain size and simultaneously expands the unit cells, resulting in an increase in Tc. Here we show that this shear strain approach is a new method for enhancing Tc and differs from that using hydrostatic strain. The enhancement of Tc is explained by an increase in net electron-electron coupling rather than a change in the density of states near the Fermi level. The shear strain effect in rhenium could be a successful example of manipulating Bardeen-Cooper-Schrieffer-type Cooper pairing, in which the unit cell volumes are indeed a key parameter.
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Affiliation(s)
- Masaki Mito
- Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
| | - Hideaki Matsui
- Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
| | - Kazuki Tsuruta
- Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
| | - Tomiko Yamaguchi
- Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
| | - Kazuma Nakamura
- Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
| | - Hiroyuki Deguchi
- Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
| | - Naoki Shirakawa
- Flexible Electronics Research Center (FLEC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
| | - Hiroki Adachi
- Graduate School of Engineering, University of Hyogo, Himeji 671-2280, Japan
| | - Tohru Yamasaki
- Graduate School of Engineering, University of Hyogo, Himeji 671-2280, Japan
| | - Hideaki Iwaoka
- Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka, 819-0395 Japan
| | - Yoshifumi Ikoma
- Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka, 819-0395 Japan
| | - Zenji Horita
- Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka, 819-0395 Japan
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka, 819-0395 Japan
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Naghavi SS, Fabrizio M, Qin T, Tosatti E. Nanoscale orbital excitations and the infrared spectrum of a molecular Mott insulator: A15-Cs 3C 60. NANOSCALE 2016; 8:17483-17488. [PMID: 27714176 DOI: 10.1039/c6nr05725j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The quantum physics of ions and electrons behind low-energy spectra of strongly correlated molecular conductors, superconductors and Mott insulators is poorly known, yet fascinating especially in orbitally degenerate cases. The fulleride insulator Cs3C60 (A15), one such system, exhibits infrared (IR) spectra with low temperature peak features and splittings suggestive of static Jahn-Teller distortions with a breakdown of orbital symmetry in the molecular site. That is puzzling, since there is no detectable static distortion, and because the features and splittings disappear upon modest heating, which they should not. Taking advantage of the Mott-induced collapse of electronic wavefunctions from lattice-extended to nanoscale localized inside a caged molecular site, we show that the unbroken spin and orbital symmetry of the ion multiplets explains the IR spectrum without adjustable parameters. This demonstrates the importance of a fully quantum treatment of nuclear positions and orbital momenta in the Mott insulator sites, dynamically but not statically distorted. The observed demise of these features with temperature is explained by the thermal population of a multiplet term whose nuclear positions are essentially undistorted, but whose energy is very low-lying. That term is in fact a scaled-down orbital excitation analogous to that of other Mott insulators, with the same spin 1/2 as the ground state, but with a larger orbital momentum of two instead of one.
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Affiliation(s)
- S S Naghavi
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA
| | - M Fabrizio
- International School for Advanced Studies (SISSA), and CNR-IOM Democritos National Simulation Center, Via Bonomea 265, I-34136 Trieste, Italy.
| | - T Qin
- International School for Advanced Studies (SISSA), and CNR-IOM Democritos National Simulation Center, Via Bonomea 265, I-34136 Trieste, Italy. and Institut für Theoretische Physik, Goethe-Universität, 60438 Frankfurt am Main, Germany
| | - E Tosatti
- International School for Advanced Studies (SISSA), and CNR-IOM Democritos National Simulation Center, Via Bonomea 265, I-34136 Trieste, Italy. and International Centre for Theoretical Physics (ICTP), Strada Costiera 11, I-34151 Trieste, Italy
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Iwahara N, Chibotaru LF. Orbital disproportionation of electronic density is a universal feature of alkali-doped fullerides. Nat Commun 2016; 7:13093. [PMID: 27713426 PMCID: PMC5059769 DOI: 10.1038/ncomms13093] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 09/01/2016] [Indexed: 11/09/2022] Open
Abstract
Alkali-doped fullerides show a wide range of electronic phases in function of alkali atoms and the degree of doping. Although the presence of strong electron correlations is well established, recent investigations also give evidence for dynamical Jahn–Teller instability in the insulating and the metallic trivalent fullerides. In this work, to reveal the interplay of these interactions in fullerides with even electrons, we address the electronic phase of tetravalent fulleride with accurate many-body calculations within a realistic electronic model including all basic interactions extracted from first principles. We find that the Jahn–Teller instability is always realized in these materials too. In sharp contrast to the correlated metals, tetravalent system displays uncorrelated band-insulating state despite similar interactions present in both fullerides. Our results show that the Jahn–Teller instability and the accompanying orbital disproportionation of electronic density in the degenerate lowest unoccupied molecular orbital band is a universal feature of fullerides. Understanding the electronic phases of alkali-doped fullerides is a long-standing and challenging task for material scientists. Here the authors show that Jahn-Teller instability and orbital disproportionation of electronic density in the lowest unoccupied molecular orbital band is universal in these systems.
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Affiliation(s)
- Naoya Iwahara
- Theory of Nanomaterials Group, Katholieke Universiteit Leuven, Celestijnenlaan 200F, Heverlee, B-3001 Leuven, Belgium
| | - Liviu F Chibotaru
- Theory of Nanomaterials Group, Katholieke Universiteit Leuven, Celestijnenlaan 200F, Heverlee, B-3001 Leuven, Belgium
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Peculiar Magnetic Features and Superconductivity in Sulfur Doped Amorphous Carbon. MAGNETOCHEMISTRY 2016. [DOI: 10.3390/magnetochemistry2030034] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Takabayashi Y, Prassides K. Unconventional high-Tc superconductivity in fullerides. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2016; 374:rsta.2015.0320. [PMID: 27501971 PMCID: PMC4978744 DOI: 10.1098/rsta.2015.0320] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/27/2016] [Indexed: 06/06/2023]
Abstract
A3C60 molecular superconductors share a common electronic phase diagram with unconventional high-temperature superconductors such as the cuprates: superconductivity emerges from an antiferromagnetic strongly correlated Mott-insulating state upon tuning a parameter such as pressure (bandwidth control) accompanied by a dome-shaped dependence of the critical temperature, Tc However, unlike atom-based superconductors, the parent state from which superconductivity emerges solely by changing an electronic parameter-the overlap between the outer wave functions of the constituent molecules-is controlled by the C60 (3-) molecular electronic structure via the on-molecule Jahn-Teller effect influence of molecular geometry and spin state. Destruction of the parent Mott-Jahn-Teller state through chemical or physical pressurization yields an unconventional Jahn-Teller metal, where quasi-localized and itinerant electron behaviours coexist. Localized features gradually disappear with lattice contraction and conventional Fermi liquid behaviour is recovered. The nature of the underlying (correlated versus weak-coupling Bardeen-Cooper-Schrieffer theory) s-wave superconducting states mirrors the unconventional/conventional metal dichotomy: the highest superconducting critical temperature occurs at the crossover between Jahn-Teller and Fermi liquid metal when the Jahn-Teller distortion melts.This article is part of the themed issue 'Fullerenes: past, present and future, celebrating the 30th anniversary of Buckminster Fullerene'.
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Affiliation(s)
- Yasuhiro Takabayashi
- World Premier International-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Kosmas Prassides
- World Premier International-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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