1
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Pustogow A, Kawasugi Y, Sakurakoji H, Tajima N. Chasing the spin gap through the phase diagram of a frustrated Mott insulator. Nat Commun 2023; 14:1960. [PMID: 37029139 PMCID: PMC10082190 DOI: 10.1038/s41467-023-37491-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Accepted: 03/16/2023] [Indexed: 04/09/2023] Open
Abstract
The quest for entangled spin excitations has stimulated intense research on frustrated magnetic systems. For almost two decades, the triangular-lattice Mott insulator κ-(BEDT-TTF)2Cu2(CN)3 has been one of the hottest candidates for a gapless quantum spin liquid with itinerant spinons. Very recently, however, this scenario was overturned as electron-spin-resonance (ESR) studies unveiled a spin gap, calling for reevaluation of the magnetic ground state. Here we achieve a precise mapping of this spin-gapped phase through the Mott transition by ultrahigh-resolution strain tuning. Our transport experiments reveal a reentrance of charge localization below T⋆ = 6 K associated with a gap size of 30-50 K. The negative slope of the insulator-metal boundary, dT⋆/dp < 0, evidences the low-entropy nature of the spin-singlet ground state. By tuning the enigmatic '6K anomaly' through the phase diagram of κ-(BEDT-TTF)2Cu2(CN)3, we identify it as the transition to a valence-bond-solid phase, in agreement with previous thermal expansion and magnetic resonance studies. This spin-gapped insulating state persists at T → 0 until unconventional superconductivity and metallic transport proliferate.
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Affiliation(s)
- A Pustogow
- Institute of Solid State Physics, TU Wien, 1040, Vienna, Austria.
| | - Y Kawasugi
- Department of Physics, Toho University, Funabashi, 274-8510, Chiba, Japan
- Condensed Molecular Materials Laboratory, RIKEN, Wako, Saitama, 351-0198, Japan
| | - H Sakurakoji
- Department of Physics, Toho University, Funabashi, 274-8510, Chiba, Japan
| | - N Tajima
- Department of Physics, Toho University, Funabashi, 274-8510, Chiba, Japan
- Condensed Molecular Materials Laboratory, RIKEN, Wako, Saitama, 351-0198, Japan
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2
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Huang Y, Mitchell T, Zheng Y, Hu Y, Benedict JB, Seo JH, Ren S. Switching charge states in quasi-2D molecular conductors. PNAS NEXUS 2022; 1:pgac089. [PMID: 36741426 PMCID: PMC9896912 DOI: 10.1093/pnasnexus/pgac089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Accepted: 06/08/2022] [Indexed: 06/18/2023]
Abstract
2D molecular entities build next-generation electronic devices, where abundant elements of organic molecules are attractive due to the modern synthetic and stimuli control through chemical, conformational, and electronic modifications in electronics. Despite its promising potential, the insufficient control over charge states and electronic stabilities must be overcome in molecular electronic devices. Here, we show the reversible switching of modulated charge states in an exfoliatable 2D-layered molecular conductor based on bis(ethylenedithio)tetrathiafulvalene molecular dimers. The multiple stimuli application of cooling rate, current, voltage, and laser irradiation in a concurrent manner facilitates the controllable manipulation of charge crystal, glass, liquid, and metal phases. The four orders of magnitude switching of electric resistance are triggered by stimuli-responsive charge distribution among molecular dimers. The tunable charge transport in 2D molecular conductors reveals the kinetic process of charge configurations under stimuli, promising to add electric functions in molecular circuitry.
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Affiliation(s)
- Yulong Huang
- Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Travis Mitchell
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Yixiong Zheng
- Department of Materials Design and Innovation, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Yong Hu
- Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Jason B Benedict
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Jung-Hun Seo
- Department of Materials Design and Innovation, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
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3
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Huang Y, Mitchell T, Yost DC, Hu Y, Benedict JB, Grossman JC, Ren S. Emerged Metallicity in Molecular Ferromagnetic Wires. NANO LETTERS 2021; 21:9746-9753. [PMID: 34757755 DOI: 10.1021/acs.nanolett.1c03663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Supramolecular engineering bridges molecular assembly with macromolecular charge-transfer salts, promising the design to construct supramolecular architectures that integrate cooperative properties difficult or impossible to find in conventional lattices. Here, we report the crystal engineering design and kinetic growth of one-dimensional supramolecular wires composed of bis(ethylenedithio)tetrathiafulvalene (ET+) cation and polymeric Cu[N(CN)2]2- anion. A bulk ferromagnetic order is discovered for filling up the gap where strong ferromagnetism is missing in such ET molecule-based charge-transfer salts. Metallicity is induced by electric current from the semiconducting wire, which is attributed to strain effect by tuning its close molecular contact. This structural feature is evidenced through the combination of various mechanistic spectroscopic studies. Electric dipole is established from the close molecular contacts and is suggestive to stabilize ferromagnetic spin interaction through anions bridging spin sites. The breakthrough shown here provides a pathway to explore low-dimensional supramolecular materials exhibiting strong electron correlation, metallicity, and ferromagnetism.
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Affiliation(s)
- Yulong Huang
- Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Travis Mitchell
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Dillon C Yost
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Yong Hu
- Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Jason B Benedict
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Jeffrey C Grossman
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Shenqiang Ren
- Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
- Research and Education in energy, Environment and Water (RENEW) Institute, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
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4
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Wang S, Zhao X, Zhang C, Yang Y, Liang J, Ni Y, Zhang M, Li J, Ye X, Zhang J, Tong Y, Tang Q, Liu Y. Suppressing Interface Strain for Eliminating Double-Slope Behaviors: Towards Ideal Conformable Polymer Field-Effect Transistors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2101633. [PMID: 34480384 DOI: 10.1002/adma.202101633] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 07/13/2021] [Indexed: 06/13/2023]
Abstract
High-mobility polymer field-effect transistors (PFETs) are being actively explored for applications in soft electronic skin and low-cost flexible displays because of their superior solution processability, mechanical flexibility, and stretchability. However, most of high-mobility PFETs often deviate from the idealized behavior with variable mobility, large threshold voltage, and high off-state current, which masks their intrinsic properties and significantly impedes their practical applications. Here, it is first revealed that interface strain between polymer thin film and rigid substrate plays a crucial role in determining the ideality of PFETs, and demonstrate that various ideal conformable PFETs can be successfully fabricated by releasing strain. It is found that strain in film can be released by one-step peeling strategy, which can reduce π-π stacking distance and suppress generation of oxygen doped carriers, thereby obtaining linearly injected charge carriers and decreased carrier concentration in channel, eventually realizing ideal PFETs. More impressively, the fabricated ideal conformable PFET array displays outstanding conformability to curved objects, and meanwhile showing excellent organic light-emitting display driving capability. The work clarifies the effect of the interface strain on the device ideality, and strain can be effectively released by a facile peeling strategy, thus offering useful guidance for the construction of ideal conformable PFETs.
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Affiliation(s)
- Shuya Wang
- Center for Advanced Optoelectronic Functional Materials Research and Key Lab of UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, 130024, China
| | - Xiaoli Zhao
- Center for Advanced Optoelectronic Functional Materials Research and Key Lab of UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, 130024, China
| | - Cong Zhang
- Center for Advanced Optoelectronic Functional Materials Research and Key Lab of UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, 130024, China
| | - Yahan Yang
- Center for Advanced Optoelectronic Functional Materials Research and Key Lab of UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, 130024, China
| | - Jing Liang
- Center for Advanced Optoelectronic Functional Materials Research and Key Lab of UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, 130024, China
| | - Yanping Ni
- Center for Advanced Optoelectronic Functional Materials Research and Key Lab of UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, 130024, China
| | - Mingxin Zhang
- Center for Advanced Optoelectronic Functional Materials Research and Key Lab of UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, 130024, China
| | - Juntong Li
- Center for Advanced Optoelectronic Functional Materials Research and Key Lab of UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, 130024, China
| | - Xiaolin Ye
- Center for Advanced Optoelectronic Functional Materials Research and Key Lab of UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, 130024, China
| | - Jidong Zhang
- Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
| | - Yanhong Tong
- Center for Advanced Optoelectronic Functional Materials Research and Key Lab of UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, 130024, China
| | - Qingxin Tang
- Center for Advanced Optoelectronic Functional Materials Research and Key Lab of UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, 130024, China
| | - Yichun Liu
- Center for Advanced Optoelectronic Functional Materials Research and Key Lab of UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun, 130024, China
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5
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Yamamoto HM. Phase-Transition Devices Based on Organic Mott Insulators. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2021. [DOI: 10.1246/bcsj.20210256] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hiroshi M. Yamamoto
- Institute for Molecular Science, Okazaki, Aichi 444-8585, Japan
- SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi 444-8585, Japan
- RIKEN, Wako, Saitama 351-0198, Japan
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6
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Abe H, Kawasaki A, Takeda T, Hoshino N, Matsuda W, Seki S, Akutagawa T. Switching of Electron and Ion Conductions by Reversible H 2O Sorption in n-Type Organic Semiconductors. ACS APPLIED MATERIALS & INTERFACES 2020; 12:37391-37399. [PMID: 32814389 DOI: 10.1021/acsami.0c09501] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Polar H2O molecules generally act as trapping sites and suppress the electron mobility of n-type organic semiconductors, making chemical design of H2O-tolerant and responsive n-type semiconductors an important step toward multifunctional electron-ion coupling devices. The introduction of effective electrostatic interactions between potassium ions (K+) and carboxylate (-COO-) anions into the electron-transporting naphthalenediimide π-framework enables the design of high-performance H2O-tolerant n-type semiconductors with a reversible H2O adsorption-desorption ability, where the electron mobility and K+ ionic conductivity were coupled with the reversible H2O sorption behavior. The reversible H2O adsorption into the crystals enhanced the electron mobility from 0.04 to 0.28 cm2 V-1 s-1, whereas the K+ ionic conductivity decreased from 3.4 × 10-5 to 4.7 × 10-7 S cm-1. Because this reversible electron-ion conducting switch is responsive to H2O sorption behavior, it is a strong candidate for H2O gating carrier transport systems.
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Affiliation(s)
- Haruka Abe
- Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
| | - Ayumi Kawasaki
- Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
| | - Takashi Takeda
- Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Norihisa Hoshino
- Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Wakana Matsuda
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Shu Seki
- Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Tomoyuki Akutagawa
- Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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7
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Liu C, Li W, Yu Y, Hao Y. A universal strategy to continuously tune the properties of materials through internal strain. RSC Adv 2020; 10:39967-39972. [PMID: 35515399 PMCID: PMC9057477 DOI: 10.1039/d0ra06765b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 10/16/2020] [Indexed: 11/21/2022] Open
Abstract
We proposed a universal strategy to continuously and precisely tune the properties of materials.
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Affiliation(s)
- Chengyuan Liu
- College of Physics and Optoelectronics
- Taiyuan University of Technology
- Taiyuan 030024
- China
| | - Wenlian Li
- State Key Laboratory of Luminescence and Applications
- Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP)
- Chinese Academy of Sciences
- Changchun 130033
- China
| | - Yuan Yu
- College of Physics and Optoelectronics
- Taiyuan University of Technology
- Taiyuan 030024
- China
| | - Yuying Hao
- College of Physics and Optoelectronics
- Taiyuan University of Technology
- Taiyuan 030024
- China
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8
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Abstract
A new superconducting field-effect transistor (FET) in the vicinity of bandwidth-controlled Mott transition was developed using molecular strongly correlated system κ-(BEDT-TTF)2Cu[N(CN)2]Br [BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene] laminated on CaF2 substrate. This device exhibited significant cooling-rate dependence of resistance below about 80 K, associated with glass transition of terminal ethylene group of BEDT-TTF molecule, where more rapid cooling through glass transition temperature leads to the decrease in bandwidth. We demonstrated that the FET properties such as ON/OFF ratio and polarity can be controlled by utilizing cooling rate. Our result may give a novel insight into the design of molecule-based functional devices.
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9
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Kawasugi Y, Seki K, Tajima S, Pu J, Takenobu T, Yunoki S, Yamamoto HM, Kato R. Two-dimensional ground-state mapping of a Mott-Hubbard system in a flexible field-effect device. SCIENCE ADVANCES 2019; 5:eaav7282. [PMID: 31093527 PMCID: PMC6510553 DOI: 10.1126/sciadv.aav7282] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2018] [Accepted: 03/27/2019] [Indexed: 06/09/2023]
Abstract
A Mott insulator sometimes induces unconventional superconductivity in its neighbors when doped and/or pressurized. Because the phase diagram should be strongly related to the microscopic mechanism of the superconductivity, it is important to obtain the global phase diagram surrounding the Mott insulating state. However, the parameter available for controlling the ground state of most Mott insulating materials is one-dimensional owing to technical limitations. Here, we present a two-dimensional ground-state mapping for a Mott insulator using an organic field-effect device by simultaneously tuning the bandwidth and bandfilling. The observed phase diagram showed many unexpected features such as an abrupt first-order superconducting transition under electron doping, a recurrent insulating phase in the heavily electron-doped region, and a nearly constant superconducting transition temperature in a wide parameter range. These results are expected to contribute toward elucidating one of the standard solutions for the Mott-Hubbard model.
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Affiliation(s)
| | - Kazuhiro Seki
- RIKEN, Wako, Saitama 351-0198, Japan
- SISSA-International School for Advanced Studies, Via Bonomea 265, 34136 Trieste, Italy
- RIKEN Center for Computational Science (R-CCS), Kobe, Hyogo 650-0047, Japan
| | - Satoshi Tajima
- Department of Physics, Toho University, Funabashi, Chiba 274-8510, Japan
| | - Jiang Pu
- Department of Applied Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - Taishi Takenobu
- Department of Applied Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
| | - Seiji Yunoki
- RIKEN, Wako, Saitama 351-0198, Japan
- RIKEN Center for Computational Science (R-CCS), Kobe, Hyogo 650-0047, Japan
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
| | - Hiroshi M Yamamoto
- RIKEN, Wako, Saitama 351-0198, Japan
- Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science, National Institutes of Natural Sciences, Okazaki, Aichi 444-8585, Japan
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10
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Kawaguchi G, Bardin AA, Suda M, Uruichi M, Yamamoto HM. An Ambipolar Superconducting Field-Effect Transistor Operating above Liquid Helium Temperature. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1805715. [PMID: 30407651 DOI: 10.1002/adma.201805715] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 10/21/2018] [Indexed: 06/08/2023]
Abstract
Superconducting (SC) devices are attracting renewed attention as the demands for quantum-information processing, meteorology, and sensing become advanced. The SC field-effect transistor (FET) is one of the elements that can control the SC state, but its variety is still limited. Superconductors at the strong-coupling limit tend to require a higher carrier density when the critical temperature (TC ) becomes higher. Therefore, field-effect control of superconductivity by a solid gate dielectric has been limited only to low temperatures. However, recent efforts have resulted in achieving n-type and p-type SC FETs based on organic superconductors whose TC exceed liquid He temperature (4.2 K). Here, a novel "ambipolar" SC FET operating at normally OFF mode with TC of around 6 K is reported. Although this is the second example of an SC FET with such an operation mode, the operation temperature exceeds that of the first example, or magic-angle twisted-bilayer graphene that operates at around 1 K. Because the superconductivity in this SC FET is of unconventional type, the performance of the present device will contribute not only to fabricating SC circuits, but also to elucidating phase transitions of strongly correlated electron systems.
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Affiliation(s)
- Genta Kawaguchi
- Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science, Okazaki, Aichi, 444-8585, Japan
| | - Andrey A Bardin
- Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow Region, 142432, Russia
| | - Masayuki Suda
- Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science, Okazaki, Aichi, 444-8585, Japan
- SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi, 444-8585, Japan
- RIKEN, Wako, Saitama, 351-0198, Japan
| | - Mikio Uruichi
- Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science, Okazaki, Aichi, 444-8585, Japan
| | - Hiroshi M Yamamoto
- Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science, Okazaki, Aichi, 444-8585, Japan
- SOKENDAI (The Graduate University for Advanced Studies), Okazaki, Aichi, 444-8585, Japan
- RIKEN, Wako, Saitama, 351-0198, Japan
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11
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Oike H, Kamitani M, Tokura Y, Kagawa F. Kinetic approach to superconductivity hidden behind a competing order. SCIENCE ADVANCES 2018; 4:eaau3489. [PMID: 30310870 PMCID: PMC6173526 DOI: 10.1126/sciadv.aau3489] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 08/31/2018] [Indexed: 06/08/2023]
Abstract
Exploration for superconductivity is one of the research frontiers in condensed matter physics. In strongly correlated electron systems, the emergence of superconductivity is often inhibited by the formation of a thermodynamically more stable magnetic/charge order. Thus, to develop the superconductivity as the thermodynamically most stable state, the free-energy balance between the superconductivity and the competing order has been controlled mainly by changing thermodynamic parameters, such as the physical/chemical pressure and carrier density. However, such a thermodynamic approach may not be the only way to materialize the superconductivity. We present a new kinetic approach to avoiding the competing order and thereby inducing persistent superconductivity. In the transition-metal dichalcogenide IrTe2 as an example, by using current pulse-based rapid cooling of up to ~107 K s-1, we successfully kinetically avoid a first-order phase transition to a competing charge order and uncover metastable superconductivity hidden behind. Because the electronic states at low temperatures depend on the history of thermal quenching, electric pulse applications enable nonvolatile and reversible switching of the metastable superconductivity, a unique advantage of the kinetic approach. Thus, our findings provide a new approach to developing and manipulating superconductivity beyond the framework of thermodynamics.
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Affiliation(s)
- Hiroshi Oike
- RIKEN Center for Emergent Matter Science, Wako 351-0198, Japan
- Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
| | - Manabu Kamitani
- RIKEN Center for Emergent Matter Science, Wako 351-0198, Japan
| | - Yoshinori Tokura
- RIKEN Center for Emergent Matter Science, Wako 351-0198, Japan
- Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
| | - Fumitaka Kagawa
- RIKEN Center for Emergent Matter Science, Wako 351-0198, Japan
- Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
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12
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Suda M, Yamamoto HM. Field-, strain- and light-induced superconductivity in organic strongly correlated electron systems. Phys Chem Chem Phys 2018; 20:1321-1331. [PMID: 29149231 DOI: 10.1039/c7cp06716j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Stimulated by the discovery of high-temperature superconductivity in 1986, band-filling control of strongly correlated electron systems has been a persistent challenge over the past three decades in condensed matter science. In particular, recent efforts have been focused on electrostatic carrier doping of these materials, utilising field-effect transistor (FET) structures to find novel superconductivity. Our group found the first field-induced superconductivity in an organic-based material in 2013 and has been developing various types of superconducting organic FETs. In this perspective, we summarise our recent results on the development of novel superconducting organic FETs. In addition, this perspective describes novel functionality of superconducting FETs, such as strain- and light-responsivity. We believe that the techniques and knowledge described here will contribute to advances in future superconducting electronics as well as the understanding of superconductivity in strongly correlated electron systems.
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Affiliation(s)
- Masayuki Suda
- Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science, Okazaki, Aichi 444-8585, Japan.
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13
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Suda M. A New Photo-Control Method for Organic–Inorganic Interface Dipoles and Its Application to Photo-Controllable Molecular Devices. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2018. [DOI: 10.1246/bcsj.20170283] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Masayuki Suda
- Institute for Molecular Science, 38, Nishigo-naka, Myodaiji, Okazaki, Aichi 444-8585
- RIKEN, 2-1, Hirosawa, Wako, Saitama 351-0198
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14
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Xu B, Chakraborty H, Remsing RC, Klein ML, Ren S. A Free-Standing Molecular Spin-Charge Converter for Ubiquitous Magnetic-Energy Harvesting and Sensing. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1605150. [PMID: 27996176 DOI: 10.1002/adma.201605150] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Revised: 11/07/2016] [Indexed: 06/06/2023]
Abstract
Magnetic-energy harvesting in a centimeter-sized free-standing (BEDT-TTF)C60 charge-transfer single crystal is demonstrated. The crystal shows sensitive magnetic-, thermal-, and mechanical-sensing ability, with an excellent piezoresistance coefficient of -5.1 × 10-6 Pa-1 . The self-powered sensing performance, together with its solution processability and flexibility, endow it with the capability of driving a new generation of noncontact magnetic-energy harvesting and sensing technologies.
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Affiliation(s)
- Beibei Xu
- Department of Mechanical Engineering and Temple Materials Institute, Temple University, Philadelphia, PA, 19122, USA
| | - Himanshu Chakraborty
- Department of Chemistry and Center for the Computational Design of Functional Layered Materials, Temple University, Philadelphia, PA, 19122, USA
| | - Richard C Remsing
- Department of Chemistry and Center for the Computational Design of Functional Layered Materials, Temple University, Philadelphia, PA, 19122, USA
| | - Michael L Klein
- Department of Chemistry, Center for the Computational Design of Functional Layered Materials, and Temple Materials Institute, Temple University, Philadelphia, PA, 19122, USA
| | - Shenqiang Ren
- Department of Mechanical Engineering and Temple Materials Institute, Temple University, Philadelphia, PA, 19122, USA
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15
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Xu B, Ren S. Integrated Charge Transfer in Organic Ferroelectrics for Flexible Multisensing Materials. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:4502-4507. [PMID: 27378088 DOI: 10.1002/smll.201600980] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 05/31/2016] [Indexed: 06/06/2023]
Abstract
The ultimate or end point of functional materials development is the realization of strong coupling between all energy regimes (optical, electronic, magnetic, and elastic), enabling the same material to be utilized for multifunctionalities. However, the integration of multifunctionalities in soft materials with the existence of various coupling is still in its early stage. Here, the coupling between ferroelectricity and charge transfer by combining bis(ethylenedithio)tetrathiafulvalene-C60 charge-transfer crystals with ferroelectric polyvinylidene fluoride polymer matrix is reported, which enables external stimuli-controlled polarization, optoelectronic and magnetic field sensing properties. Such flexible composite films also display a superior strain-dependent capacitance and resistance change with a giant piezoresistance coefficient of 7.89 × 10(-6) Pa(-1) . This mutual coupled material with the realization of enhanced couplings across these energy domains opens up the potential for multisensing applications.
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Affiliation(s)
- Beibei Xu
- Department of Mechanical Engineering and Temple Materials Institute, Temple University, Philadelphia, PA, 19122, USA
| | - Shenqiang Ren
- Department of Mechanical Engineering and Temple Materials Institute, Temple University, Philadelphia, PA, 19122, USA
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16
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Electron-hole doping asymmetry of Fermi surface reconstructed in a simple Mott insulator. Nat Commun 2016; 7:12356. [PMID: 27492864 PMCID: PMC5155723 DOI: 10.1038/ncomms12356] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2015] [Accepted: 06/24/2016] [Indexed: 11/21/2022] Open
Abstract
It is widely recognized that the effect of doping into a Mott insulator is complicated and unpredictable, as can be seen by examining the Hall coefficient in high Tc cuprates. The doping effect, including the electron–hole doping asymmetry, may be more straightforward in doped organic Mott insulators owing to their simple electronic structures. Here we investigate the doping asymmetry of an organic Mott insulator by carrying out electric-double-layer transistor measurements and using cluster perturbation theory. The calculations predict that strongly anisotropic suppression of the spectral weight results in the Fermi arc state under hole doping, while a relatively uniform spectral weight results in the emergence of a non-interacting-like Fermi surface (FS) in the electron-doped state. In accordance with the calculations, the experimentally observed Hall coefficients and resistivity anisotropy correspond to the pocket formed by the Fermi arcs under hole doping and to the non-interacting FS under electron doping. Electron or hole doping in a Mott insulator leads to superconductivity, with the mechanism obscured by multi-orbital Fermi surface reconstructions. Here, Kawasugi et al. report doping dependent Hall coefficients and resistivity anisotropy of an organic Mott insulator, revealing doping asymmetry of reconstructed Fermi surface of a single electronic orbital.
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17
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Noguchi Y, Saeki A, Fujiwara T, Yamanaka S, Kumano M, Sakurai T, Matsuyama N, Nakano M, Hirao N, Ohishi Y, Seki S. Pressure Modulation of Backbone Conformation and Intermolecular Distance of Conjugated Polymers Toward Understanding the Dynamism of π-Figuration of their Conjugated System. J Phys Chem B 2015; 119:7219-30. [DOI: 10.1021/jp5100389] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yuki Noguchi
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1
Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Akinori Saeki
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1
Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Takenori Fujiwara
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1
Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Sho Yamanaka
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1
Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Masataka Kumano
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1
Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Tsuneaki Sakurai
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1
Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Naoto Matsuyama
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1
Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Motohiro Nakano
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1
Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Naohisa Hirao
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Yasuo Ohishi
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Shu Seki
- Department
of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1
Yamadaoka, Suita, Osaka 565-0871, Japan
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