Lattice instability and elastic dispersion due to the rattling motion in the type-I clathrate Ba_8Ga_<16>Sn_<30>
Physical Review B 85 巻 8 号
085101-1-085101-7 頁
2012 発行
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| ファイル情報(添付) | |
| タイトル ( eng ) |
Lattice instability and elastic dispersion due to the rattling motion in the type-I clathrate Ba_8Ga_<16>Sn_<30>
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| 作成者 |
Suetomi Yasuhiko
Fujita Takahiro K.
Tanaka Tomoo
Marcos A. Avila
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| 収録物名 |
Physical Review B
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| 巻 | 85 |
| 号 | 8 |
| 開始ページ | 085101-1 |
| 終了ページ | 085101-7 |
| 抄録 |
To investigate the off-center rattling motion and its charge-carrier dependence in type-I clathrate compounds, we carried out ultrasonic measurements on type-I Ba8Ga16Sn30 and a reference compound, K8Ga8Sn38. We found elastic softening of C44 originating from a lattice instability due to the off-center rattling motion of Ba atom in Ba8Ga16Sn30. Elastic softening below 1 K suggests that the lattice instability remains at very low temperatures. We also found ultrasonic dispersion which has no mode selectivity. No-mode-selective ultrasonic dispersion in Ba8Ga16Sn30 would be caused by a strong electron-phonon coupling. No charge-carrier dependence is observed between n-type and p-type Ba8Ga16Sn30. The significant softening on the bulk modulus in Ba8Ga16Sn30 contrasts to the continuous hardening in K8Ga8Sn38, indicating the central role of the rattling motion in the softening.
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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 | 2012 |
| 権利情報 |
(c) 2012 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 |
[ISSN] 1098-0121
[DOI] 10.1103/PhysRevB.85.085101
[NCID] AA11187113
[DOI] http://dx.doi.org/10.1103/PhysRevB.85.085101
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