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  1. B200 工学部/工学研究科
  2. B200a 雑誌掲載論文
  3. 学術雑誌

Odd-frequency pairs and Josephson current through a strong ferromagnet

http://hdl.handle.net/2237/11285
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
PhysRevB_76_224525.pdf PhysRevB_76_224525.pdf (668.8 kB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2009-03-10
タイトル
タイトル Odd-frequency pairs and Josephson current through a strong ferromagnet
言語 en
著者 Asano, Yasuhiro

× Asano, Yasuhiro

WEKO 27066

en Asano, Yasuhiro

Search repository
Sawa, Yuki

× Sawa, Yuki

WEKO 27067

en Sawa, Yuki

Search repository
Tanaka, Yukio

× Tanaka, Yukio

WEKO 27068

en Tanaka, Yukio

Search repository
Golubov, Alexander A.

× Golubov, Alexander A.

WEKO 27069

en Golubov, Alexander A.

Search repository
アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利
言語 en
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.
言語 en
内容記述タイプ Abstract
出版者
言語 en
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
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
DOI
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.1103/PhysRevB.76.224525
ISSN
収録物識別子タイプ PISSN
収録物識別子 1098-0121
書誌情報 en : PHYSICAL REVIEW B

巻 76, 号 22, p. 224525-224525, 発行日 2007-12
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
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