Spontaneous spin current near the interface between ferromagnets and unconventional superconductors

Details Spontaneous spin current near the interface between ferromagnets and unconventional superconductors Spontaneous spin current near the interface between ferromagnets and unconventional superconductors

2002-10-10

arxiv.org/abs/cond-mat/0210232v1

Physics

Condensed Matter

Strongly Correlated Electrons

Proceedings of LT23

Scientific paper

10.1016/S0921-4526(02)02367-0

Proximity effects between ferromagnets (F) and superconductors (S) with broken time-reversal symmetry (T) are studied theoretically. For the S side we consider a chiral (p_x \pm 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} \pm is)-state. The Bogoliubov de Gennes equation which describes the spatial variations of the superconducting order parameter and the magnetization is derived and solved numerically. It is found that a spontaneous spin current flows along the interface between the (p_x \pm ip_y)-wave superconductor and the ferromagnet. On the contrary, in the case of a [110] interface of the d_{x^2-y^2}-wave SC, the surface state has a (d \pm p_x \pm p_y)-wave (or (d_{x^2-y^2} \pm is)-wave) symmetry, and thus no (only charge) spontaneous current arises.

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