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Quasiparticle density of states in a half metal in the presence of odd‐frequency Cooper pairs
Author(s) -
Asano Yasuhiro,
Yokoyama Takehito,
Tanaka Yukio,
Golubov Alexander A.
Publication year - 2008
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200776451
Subject(s) - cooper pair , quasiparticle , condensed matter physics , superconductivity , josephson effect , density of states , physics , local density of states , penetration depth , scattering , quantum mechanics
We study the local density of states in a half metal sandwiched by the two superconductors. The spin‐flip scattering at the junction interface opens the Josephson channels of the odd‐frequency spin‐triplet s‐wave Cooper pairs. The penetration of the odd‐frequency pairs enhances the quasiparticle density of states near the Fermi energy in a half metal, which is responsible for the unusual nonmonotonic temperature dependence of the Josephson current. On the basis of calculated results, we propose experiments to confirm the odd‐frequency Cooper pairs. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)