Robustness of Spin-Triplet Pairing and Singlet--Triplet Pairing Crossover in Superconductor/Ferromagnet Hybrids
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概要
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We have investigated the proximity effect in superconductor/ferromagnet junctions in a systematic manner to discuss the relationship between the zero-energy peak (ZEP) of the local density of states (LDOS) and spin-triplet odd-frequency pairing. 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 pairing in such systems. We also found that the crossover from singlet pairing to triplet pairing can be detected by measuring the F layer thickness dependence of the ZEP height. Furthermore, we show how to observe signatures of spin-triplet odd-frequency pairing and the pairing crossover by LDOS measurement. Our results provide a direct way to experimentally detect signatures of the odd-frequency pairing state.
- 2013-12-15
著者
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Asano Yasuhiro
Department Of Applied Physics And Chemistry Fukui University Of Technology
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Tanaka Yukio
Department Of Applied Physics Nagoya University
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Asano Yasuhiro
Department of Applied Physics, Hokkaido University, Sapporo 060-8628, Japan
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Kawabata Shiro
Electronics and Photonics Research Institute (ESPRIT), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan
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Golubov Alexander
Faculty of Science and Technology and MESA+ Institute of Nanotechnology, University of Twente, 7500 AE, Enschede, The Netherlands
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