Spontaneous spin current near the interface between unconventional superconductors and ferromagnets

[摘要] We study theoretically the proximity effect between ferromagnets (F) and superconductors (S) with broken time-reversal symmetry (T). A chiral (p(x)+/-ip(y))-wave and a d(x)(2)-y(2)-wave superconductor, the latter of which can form T-breaking surface state-i.e., (d(x)(2)-y(2)+/-is) state-are considered for the S side. The spatial variations of the superconducting order parameters and the magnetization are determined by solving the Bogoliubov-de Gennes equation. In the case of a chiral (p(x)+/-ip(y))-wave superconductor, a spontaneous spin current flows along the interface, but not in the case of a d(x)(2)-y(2)-wave superconductor. For a F/S(p(x)+/-ip(y))/F trilayer system, total spin current can be finite while total charge current vanishes, if the magnetizations of two F layers are antiparallel.

[发布日期] 2004-12-01

[关键词] REVERSAL SYMMETRY-BREAKING;D-WAVE SUPERCONDUCTORS;HIGH-TEMPERATURE SUPERCONDUCTORS;QUASI-PARTICLE TRANSPORT;T-C SUPERCONDUCTORS;TIME-REVERSAL;ORDER PARAMETERS;SURFACE;STATES;JUNCTIONS