Raman scattering from vibrational modes in Si46 clathrates
Physical Review B - Condensed Matter and Materials Physics 57 巻 13 号
7686-7693 頁
1998-04-01 発行
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| ファイル情報(添付) | |
| タイトル ( eng ) |
Raman scattering from vibrational modes in Si46 clathrates
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| 作成者 |
Fang S. L.
Grigorian L.
Ekkund P. C.
Dresselhaus G.
Dresselhaus M. S.
Kawaji H.
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| 収録物名 |
Physical Review B - Condensed Matter and Materials Physics
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| 巻 | 57 |
| 号 | 13 |
| 開始ページ | 7686 |
| 終了ページ | 7693 |
| 抄録 |
Room-temperature Raman-scattering spectra are reported for the type-II superconductors MxBaySi46 (M =Na,K) that were recently shown to exhibit Tc's ∼3.5 K. These spectra are compared to those of Na8Si46 and K7Si46 clathrates that exhibit normal metallic behavior down to 2 K. In the Si46 system, fifteen of the eighteen Si related first-order Raman frequencies predicted by group theory have been detected, and the frequencies are found to be sensitive to the particular dopants. The Raman linewidths observed for the MxBaySi46 system are comparable to those observed for Na8Si46 and K7Si46. The data, taken collectively, suggest that the line broadening in the metallic Si clathrates is due to important contributions from both the electron-phonon interaction as well as from a random filling of the Si cages and charge-transfer disorder.
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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 | 1998-04-01 |
| 権利情報 |
Copyright (c) 1998 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.57.7686
[DOI] http://dx.doi.org/10.1103/PhysRevB.57.7686
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