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  1. 050 理学部
  2. 10 学術雑誌論文
  3. 10 査読済論文
  1. 0 資料タイプ別
  2. 01 学術雑誌論文

A Possible Bipolaronic Transition in β-pyrochlore Compounds

http://hdl.handle.net/10191/26910
http://hdl.handle.net/10191/26910
b24473b2-40c7-4982-8851-1ceb9d011574
名前 / ファイル ライセンス アクション
980.pdf 980.pdf (130.5 kB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2014-04-16
タイトル
タイトル A Possible Bipolaronic Transition in β-pyrochlore Compounds
タイトル
言語 en
タイトル A Possible Bipolaronic Transition in β-pyrochlore Compounds
言語
言語 eng
キーワード
主題Scheme Other
主題 β-Pyrochlore oxide
キーワード
主題Scheme Other
主題 KOs2O6
キーワード
主題Scheme Other
主題 Bipolaronic transition
キーワード
主題Scheme Other
主題 Hubbard–Holstein model
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ journal article
著者 Fuse, T.

× Fuse, T.

WEKO 7659

Fuse, T.

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Ono, Y.

× Ono, Y.

WEKO 62

Ono, Y.

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抄録
内容記述タイプ Abstract
内容記述 We investigate the Hubbard–Holstein model by using the dynamical mean-field theory combined with the exact diagonalization method. Below a critical temperature Tcr, a coexistence of two solutions, small lattice fluctuating solution (polaronic state) and large one (bipolaronic state), is found for the same value of the electron–phonon coupling g in the range gc1<g<gc2 for a fixed value of the Coulomb interaction U. As the result, the system shows a first-order phase transition at Tp(<T cr) from the bipolaronic to the polaronic states as T decreases. The effective potential for oscillating atoms, which is renormalized due to the effect of g, is double-well type for T>Tp, while it is single-well type for T<Tp. The obtained transition for small U case with small Tp and discontinuities in physical quantities seems to be account for the rattling transition observed in the β-pyrochlore oxide KOs2O6.
書誌情報 Physica. C, Superconductivity and its applications
en : Physica. C, Superconductivity and its applications

巻 470, 号 Supplement 1, p. S701-S702, 発行日 2010-12
出版者
出版者 Elsevier
ISSN
収録物識別子タイプ ISSN
収録物識別子 09214534
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AA11461984
DOI
識別子タイプ DOI
関連識別子 info:doi/10.1016/j.physc.2010.01.022
著者版フラグ
値 author
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