SPIN-CNR, I-84084 Fisciano (Salerno), Italy and Dipartimento di Fisica "E. R. Caianiello," Università di Salerno, I-84084 Fisciano (Salerno), Italy.
Phys Rev Lett. 2013 Aug 30;111(9):097003. doi: 10.1103/PhysRevLett.111.097003. Epub 2013 Aug 27.
We study the interplay of spin and orbital degrees of freedom in a triplet superconductor-ferromagnet junction. Using a self-consistent spatially dependent mean-field theory, we show that increasing the angle between the ferromagnetic moment and the triplet vector order parameter enhances or suppresses the p-wave gap close to the interface, according to whether the gap antinodes are parallel or perpendicular to the boundary, respectively. The associated change in condensation energy establishes an orbitally dependent preferred orientation for the magnetization. When both gap components are present, as in a chiral superconductor, first-order transitions between different moment orientations are observed as a function of the exchange field strength.
我们研究了三重态超导体-铁磁体结中自旋和轨道自由度的相互作用。通过自洽的空间相关平均场理论，我们表明，随着铁磁矩与三重态矢量有序参数之间的夹角的增加，当间隙节点分别与边界平行或垂直时，接近界面的 p 波能隙会增强或抑制。相应的凝聚能变化为磁化建立了一个轨道相关的优选方向。当两个间隙分量都存在时，例如在手性超导体中，随着交换场强度的变化，观察到不同磁矩方向之间的一级相变。
