Fulde-Ferrell-Larkin-Ovchinnikov State and Field-Induced Superconductivity in an Organic Superconductor
arXiv:cond-mat/0203109 · doi:10.1143/JPSJ.71.1644
Abstract
An experimental phase diagram of the field-induced superconductivity in the lambda-(BETS)_2FeCl_4 compound is theoretically reproduced by a combination of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state and the Jaccarino-Peter mechanism. Semi-quantitative agreement is obtained in the presence of a very weak subdominant triplet pairing interaction between electrons with antiparallel spins, in addition to a dominant singlet pairing interaction. An order-parameter mixing effect enhances the FFLO state, and plays an essential role in the semi-quantitative agreement. As a possible origin of the small triplet component, pairing interactions mediated by spin fluctuations are proposed. It is discussed that in this mechanism of the pairing interactions equal spin pairing interactions are much weaker than the antiparallel spin pairing interactions in the strong magnetic field, which is consistent with the absence of observation of the equal spin state.
5 pages, 5 figures, revtex.sty, submitted to J.Phys.Soc.Jpn., v2: minor change in ref., v3:published version
References in corpus (6)
- Superconductivity in an organic insulator at very high magnetic fields
- Phase Fluctuations and Kosterlitz-Thouless Transition in Two-Dimensional Fulde-Ferrell-Larkin-Ovchinnikov Superconductors
- Magnetic-field-induced superconductivity in layered organic molecular crystals with localized magnetic moments
- Temperature dependence of the upper critical field of an anisotropic singlet superconductivity in a square lattice tight-binding model in parallel magnetic fields
- Anisotropic superconductivity mediated by phonons in layered compounds with weak screening effect
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