Recent Topics of Organic Superconductors
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概要
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Recent developments in research into superconductivity in organic materials are reviewed. In the epoch-defining quasi-one-dimensional TMTSF superconductors with T_{\text{c}} \sim 1 K, T_{\text{c}} decreases monotonically with increasing pressure, as do signatures of spin fluctuations in the normal state, providing good evidence for magnetically-mediated pairing. Upper critical fields exceed the Zeeman-limiting field by several times, suggesting triplet pairing or a transition to an inhomogeneous superconducting state at high magnetic fields, while triplet pairing is ruled out at low fields by NMR Knight-shift measurements. Evidence for a spatially inhomogeneous superconducting state, Fulde--Ferrel--Larkin--Ovchinnikov state, which has long been sought in various superconducting systems, is now captured by thermodynamic and transport measurements for clean and highly two-dimensional BEDT-TTF and BETS superconductors. Some of the layered superconductors also serve as model systems for Mott physics on anisotropic triangular lattice. For example, the Nernst effect and the pseudo-gap behavior in NMR relaxation are enhanced near to the Mott transition. In the case of increasing spin frustration, the superconducting transition temperature is depressed, and antiferromagnetic ordering is eliminated altogether in the adjacent Mott insulating phase. There is an increasing number of materials exhibiting superconductivity in competition or cooperation with charge order. Theoretical studies shed light on the role of spin and/or charge fluctuations for superconductivity appearing under conditions close to those of correlation-induced insulating phases in the diversity of organic materials.
- 2012-01-15
著者
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UJI Shinya
National Institute for Materials Science
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Kuroki Kazuhiko
Department Of Applied Physics And Chemistry The University Of Electro-communications
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Mori Hatsumi
Institute For Solid State Physics The University Of Tokyo
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Kanoda Kazushi
Department Of Applied Physics The University Of Tokyo
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Ogata Masao
Department Of Basic Science Graduate School Of Arts And Science University Of Tokyo
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Brown Stuart
Department of Physics and Astronomy, UCLA
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Kagoshima Seiichi
Deaprtment of Physics, Meiji University, Tama-ku, Kawasaki 214-8571, Japan
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Brown Stuart
Department of Physics and Astronomy, UCLA, Los Angeles, CA 90095-1547, U.S.A.
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Ardavan Arzhang
Clarendon Laboratory, Department of Physics, University of Oxford, OX1 3PU, U.K.
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Wosnitza Jochen
Hochfeld-Magnetlabor Dresden, Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany
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Wosnitza Jochen
Hochfeld-Magnetlabor Dresden, Helmholtz-Zentrum Dresden-Rossendorf and TU Dresden, D-01314 Dresden, Germany
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