Vibrational modes in silicon clathrate compounds: A key to understanding superconductivity

Physical Review B - Condensed Matter and Materials Physics 66 巻 1 号 014532- 頁 2002-07-01 発行
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タイトル ( eng )
Vibrational modes in silicon clathrate compounds: A key to understanding superconductivity
作成者
Reny E.
San-Miguel A.
Guyot Y.
Masenelli B.
Mélinon P.
Saviot L.
Champagnon B.
Cros C.
Pouchard M.
Borowski M.
Dianoux A. J.
収録物名
Physical Review B - Condensed Matter and Materials Physics
66
1
開始ページ 014532
抄録
Several doped type-I silicon clathrates (Na8 @Si46, K8@Si46, Ba8@Si46 and I8@Si46) have been investigated both experimentally by inelastic neutron scattering and x-ray-absorption spectroscopy and theoretically by ab initio calculations. We find that Ba atoms have a stronger coupling with the host lattice than Na or K ones. We show that in the superconductor Ba8@Si46 the coupling is effectively done by host acoustic phonons exciting guest acoustic modes. These features suggest that the host-guest vibrational coupling is a crucial parameter to explain the appearance of superconductivity in addition to the density of states near the Fermi level.
NDC分類
物理学 [ 420 ]
言語
英語
資源タイプ 学術雑誌論文
出版者
American Physical Society
発行日 2002-07-01
権利情報
Copyright (c) 2002 American Physical Society
出版タイプ Version of Record(出版社版。早期公開を含む)
アクセス権 オープンアクセス
収録物識別子
[NCID] AA11187113
[ISSN] 1098-0121
[DOI] 10.1103/PhysRevB.66.014532
[DOI] http://dx.doi.org/10.1103/PhysRevB.66.014532