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Odd-frequency pairs and Josephson current through a strong ferromagnet
http://hdl.handle.net/2237/11285
41159323-055d-4842-abd5-9324f38ebc74
名前 / ファイル | ライセンス | アクション | |
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2009-03-10 | |||||
タイトル | ||||||
タイトル | Odd-frequency pairs and Josephson current through a strong ferromagnet | |||||
著者 |
Asano, Yasuhiro
× Asano, Yasuhiro× Sawa, Yuki× Tanaka, Yukio× Golubov, Alexander A. |
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権利 | ||||||
権利情報 | American Physical Society, All rights reserved. | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Cooper pairs | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | critical current density (superconductivity) | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | electronic density of states | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | exchange interactions (electron) | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | ferromagnetic materials | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Green's function methods | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | interface states | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Josephson effect | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | magnetic superconductors | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | mesoscopic systems | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | quasiparticles | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | scanning tunnelling microscopy | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | spin fluctuations | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | triplet state | |||||
抄録 | ||||||
内容記述 | 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. | |||||
内容記述タイプ | Abstract | |||||
出版者 | ||||||
出版者 | American Physical Society | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプresource | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
DOI | ||||||
関連識別子 | ||||||
識別子タイプ | DOI | |||||
関連識別子 | http://dx.doi.org/10.1103/PhysRevB.76.224525 | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1098-0121 | |||||
書誌情報 |
PHYSICAL REVIEW B 巻 76, 号 22, p. 224525-224525, 発行日 2007-12 |
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フォーマット | ||||||
application/pdf | ||||||
著者版フラグ | ||||||
値 | publisher | |||||
URI | ||||||
識別子 | http://hdl.handle.net/2237/11285 | |||||
識別子タイプ | HDL |