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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| ファイル情報(添付) | |
| タイトル ( eng ) |
Vibrational modes in silicon clathrate compounds: A key to understanding superconductivity
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| 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.
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| 収録物名 |
Physical Review B - Condensed Matter and Materials Physics
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| 巻 | 66 |
| 号 | 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.
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| NDC分類 |
物理学 [ 420 ]
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| 言語 |
英語
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| 資源タイプ | 学術雑誌論文 |
| 出版者 |
American Physical Society
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| 発行日 | 2002-07-01 |
| 権利情報 |
Copyright (c) 2002 American Physical Society
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| 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
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