@article{oai:nagoya.repo.nii.ac.jp:00009503,
 author = {Asano, Yasuhiro and Sawa, Yuki and Tanaka, Yukio and Golubov, Alexander A.},
 issue = {22},
 journal = {PHYSICAL REVIEW B},
 month = {Dec},
 note = {We study Josephson current in superconductor/diffusive ferromagnet/superconductor junctions by using the recursive Green function method. When the exchange potential in a ferromagnet is sufficiently large compared to the pair potential in a superconductor, an ensemble average of Josephson current is much smaller than its mesoscopic fluctuations. The Josephson current vanishes when the exchange potential is extremely large so that a ferromagnet is half-metallic. Spin-flip scattering at junction interfaces drastically changes the characteristic behavior of Josephson current. In addition to spin-singlet Cooper pairs, equal-spin triplet pairs penetrate into a half metal. Such equal-spin pairs have an unusual symmetry property called odd-frequency symmetry and carry the Josephson current through a half metal. The penetration of odd-frequency pairs into a half metal enhances the low energy quasiparticle density of states, which could be detected experimentally by scanning tunneling spectroscopy. We will also show that odd-frequency pairs in a half metal cause a nonmonotonic temperature dependence of the critical Josephson current.},
 pages = {224525--224525},
 title = {Odd-frequency pairs and Josephson current through a strong ferromagnet},
 volume = {76},
 year = {2007}
}