Shiro Kawabata, Yasuhiro Asano, Yukio Tanaka, Alexander A. Golubov
We have investigated the proximity effect in superconductor/ferromagnet junctions in a systematic manner to discuss the relation between the zero energy peak (ZEP) of the local density of states (LDOS) and spin-triplet odd-frequency paring. By exactly solving the nonlinear Usadel equations, we have found that the ZEP is realized in a wide range of geometrical and material parameters in the case of the noncollinear magnetization. This strongly suggests the robustness of the ZEP induced by spin-triplet odd-frequency paring in such systems. We also found that the crossover from singlet to triplet paring can be detected by measuring the F layer thickness dependence of the ZEP height. Further, we show how to observe signatures of spin-triplet odd-frequency paring and the paring crossover by the LDOS measurements. Our results provide a direct way to experimentally detect signatures of odd-frequency paring state.
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http://arxiv.org/abs/1302.6281
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