Spin-dependent quasiparticle reflection and bound states at interfaces with itinerant antiferromagnets

被引：38
作者：
Bobkova, IV [1 ]
Hirschfeld, PJ
Barash, YS
机构：
[1] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Moscow Reg, Russia
[2] Univ Florida, Dept Phys, Gainesville, FL 32611 USA
来源：
PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 03期
关键词：
D O I：
10.1103/PhysRevLett.94.037005
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We find a novel channel of quasiparticle reflection from the simplest two-sublattice antiferromagnet (AF) on a bipartite lattice. Low-energy quasiparticles in a normal metal (N) experience spin-dependent retroreflection at AF/N interfaces. As a combined effect of antiferromagnetic and Andreev reflections, subgap Andreev states arise at an AF/superconductor (SC) interface. When the antiferromagnetic reflection dominates the specular one, Andreev bound states have almost zero energy on AF/s-wave superconductor (sSC) interfaces, whereas there are no low-energy subgap states on AF/d-wave superconductor (dSC) boundaries. For an sSC/AF/sSC junction, the bound states are found to split, due to the finite width of the AF interlayer, and carry the supercurrent. The theory developed in the present Letter is based on a novel quasiclassical approach, which applies to interfaces involving itinerant antiferromagnets.
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