Temperature Dependence of the Upper Critical Field of Anisotropic Singlet Superconductivity in a Square Lattice Tight-Binding Model in Parallel Magnetic Fields(Condensed Matter : Electronic Structure, Electrical, Mgagnetic and Optical Properties)
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概要
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The upper critical field parallel to the conducting layer is studied in anisotropic type II superconductors on square lattices. We assume sufficient separation of the adjacent layers, for which the orbital pairbreaking effect is suppressed for precisely aligned parallel magnetic fields. In particular, we examine the temperature dependence of the critical field H_c(T) of the superconductivity including the Fulde-Feffell-Larkin-Ovchinnikov (FFLO or LOFF) state, in which the Cooper pairs have nonzero center-of-mass momentum q. In the system with the cylindrically symmetric Fermi surface, it is known that H_c(T) of the d-wave FFLO state exhibits a kink at a low temperature due to a change in the direction of q in contrast to observations in organic superconductors. It is shown that the kink disappears when the Fermi surface is anisotropic to some extent, since the direction of q is locked in an optimum direction independent of temperature.
- 社団法人日本物理学会の論文
- 2002-05-15
著者
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Shimahara Hiroshi
Department Of Quantum Matter Science Adsm
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MORIWAKE Kentaro
Department of Quantum Matter Science, ADSM, Hiroshima University
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Moriwake Kentaro
Department Of Quantum Matter Science Adsm Hiroshima University
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