论文标题
J-电子超导性和应用于UTE2的顺磁性效应
Paramagnetic effects of j-electron superconductivity and application to UTe2
论文作者
论文摘要
推定的自旋三键超导体UTE2具有类似ISING的磁各向异性，表明库珀对旋转与易于轴平行。但是，硬轴方向的上部临界场远大于易于轴的临界场，即使在硬轴方向上，也暗示着强烈的Pauli Depairing效果。该观察结果与最近的NMR测量结果一致，该测量表明硬轴磁场的过渡温度TC以下骑士移位的降低很小。我们澄清说，这些行为自然是由于具有总角动量J = 5/2的多轨F-电子带的结果。考虑到正骨结构的自旋轨道耦合，我们证明，对于硬轴磁场，旋转易感性的降低在TC以下和Pauli Depairing效果下得到了强烈抑制。
The putative spin-triplet superconductor UTe2 has an Ising-like magnetic anisotropy, indicating the Cooper pair spins parallel to the easy-axis. However, the upper critical field for the hard-axis direction is much larger than that for the easy-axis, implying the strong suppression of the Pauli depairing effect even for the hard-axis direction. This observation is consistent with the recent NMR measurements which show the tiny decrease of the Knight shift below the transition temperature Tc for hard-axis magnetic fields. We clarify that these behaviors are naturally understood as a result of multi-orbital f -electron bands with total angular momentum j=5/2. Taking into account spin-orbit couplings for an orthorhombic structure, we demonstrate that for hard-axis magnetic fields, the decrease of the spin susceptibility below Tc and the Pauli depairing effect are strongly suppressed.
