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Upper critical field parallel to the conducting layer is studied inanisotropic type-II superconductors on square lattices. We assume enoughseparation of the adjacent layers, for which the orbital pair-breaking effectis suppressed for exactly aligned parallel magnetic field. In particular, weexamine the temperature dependence of the critical field H_c(T) of thesuperconductivity including the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO or LOFF)state, in which the Cooper pairs have non-zero center-of-mass momentum q. Inthe system with the cylindrically symmetric Fermi-surface, it is known thatH_c(T) of the d-wave FFLO state exhibits a kink at a low temperature due to achange of the direction of q in contrast to observations in organicsuperconductors. It is shown that the kink disappears when the Fermi-surface isanisotropic to some extent, since the direction of q is locked in an optimumdirection independent of the temperature.Comment: 5 pages, 5 figures, revtex.sty, submitted to J.Phys.Soc.Jp

journal of the physical society of japan

Temperature Dependence of the Upper Critical Field of Anisotropic Singlet Superconductivity in a Square Lattice Tight-Binding Model in Parallel Magnetic Fields