论文标题
在强烈的Pauli限制的准二维超导体中，在垂直磁场中的Fulde-Ferrell-Larkin-ovchinnikov State在垂直的磁场中
Fulde-Ferrell-Larkin-Ovchinnikov State in Perpendicular Magnetic Fields in Strongly Pauli-Limited Quasi-Two-Dimensional Superconductors
论文作者
论文摘要
我们检查了FFLO态在强限的Q2D超导体中称为FFLO状态的Fermi-Surface效应，重点介绍了3D因子的效果，例如层间电子转移，层间层配对和平面磁场，包括垂直于最有电导层的效果。我们检查了具有较大MAKI参数的系统，以使轨道搭配的效果可忽略不计，除了锁定FFLO矢量Q方向在野外方向上。与图层平行的场。因此，有时已经提出，嵌套效应几乎不能增强FFLO态在垂直场中的稳定性。我们说明，与这种观点相反，嵌套效应可以强烈稳定垂直场的FFLO态，以及当TZ较小时的平行场，以使费米表面在Kz方向上打开，TZ表示中间层转移能。特别是，垂直场中的嵌套效应在层间状态下可能很强。例如，在带有圆柱体费米表面的系统中，tz /= 0扭曲了dlt_k prop sin k_z的层间状态显示垂直场的MU_E HC = 1.65 dlt_a0，对于典型值而言，该范围比典型值大得多，如MU_E_E______________________。 D-Wave状态的Delta_d0在带有TZ = 0的圆柱系统中。目前的结果可能会提供物理原因，为什么在Cecoin5和FESE中，垂直和平行场的高场相和平行场中的相图中的区域在相同的阶段。
We examine the Fermi-surface effect called the nesting effect for the FFLO state in strongly Pauli-limited Q2D superconductors, focusing on the effect of 3D factors, such as interlayer electron transfer, interlayer pairing, and off-plane magnetic fields including those perpendicular to the most conductive layers. We examine the systems with a large Maki parameter so that the orbital pair-breaking effect is negligible, except for the locking of the direction of the FFLO vector q in the field direction.It is known that the nesting effect for the FFLO state can be strong in QLD systems in which the orbital pair-breaking effect is suppressed by applying the mag. field parallel to the layers. Hence, it has sometimes been suggested that the nesting effect may hardly enhance the stability of the FFLO state for perpendicular fields. We illustrate that, contrary to this view, the nesting effect can strongly stabilize the FFLO state for perpendicular fields as well as for parallel fields when tz is small so that the Fermi surfaces are open in the kz-direction, where tz denotes the interlayer transfer energy. In particular, the nesting effect in perpendicular fields can be strong in interlayer states. For example, in systems with cylindrical Fermi surfaces warped by tz /= 0, interlayer states with Dlt_k prop sin k_z exhibit mu_e Hc=1.65 Dlt_a0 for perpendicular fields, which is much larger than typical values for parallel fields, such as mu_e Hc=Dlt_s0 of the s-wave state and mu_e Hc = 1.28 Delta_d0 of the d-wave state in cylindrical systems with tz=0. The present result could potentially provide a physical reason why the areas in the phase diagrams occupied by the high-field phases for the perpendicular and parallel fields are of the same order in CeCoIn5 and FeSe.
