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Temperature-dependence of spin-polarized transport in ferromagnet / unconventional superconductor junctions

T. Hirai·Y. Tanaka·N. Yoshida·Y. Asano·J. Inoue·S. Kashiwaya
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Abstract

Tunneling conductance in ferromagnet / unconventional superconductor junctions is studied theoretically as a function of temperatures and spin-polarization in feromagnets. In d-wave superconductor junctions, the existence of a zero-energy Andreev bound state drastically affects the temperature-dependence of the zero-bias conductance (ZBC). In p-wave triplet superconductor junctions, numerical results show a wide variety in temperature-dependence of the ZBC depending on the direction of the magnetic moment in ferromagnets and the pairing symmetry in superconductors such as $p_{x}$, $p_{y}$ and $p_{x}+ip_{y}$-wave pair potential. The last one is a promising symmetry of Sr$_2$RuO$_4$. From these characteristic features in the conductance, we may obtain the information about the degree of spin-polarization in ferromagnets and the direction of the $d$-vector in triplet superconductors.

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T. Hirai, Y. Tanaka, N. Yoshida, Y. Asano, J. Inoue, S. Kashiwaya. 2003-02-19. Temperature-dependence of spin-polarized transport in ferromagnet / unconventional superconductor junctions. https://doi.org/10.1103/physrevb.67.174501

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