NMR study in the superconducting silicon clathrate compound NaxBaySi46
Physical Review B - Condensed Matter and Materials Physics 54 巻 18 号
13242-13246 頁
1996-11-01 発行
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| ファイル情報(添付) | |
| タイトル ( eng ) |
NMR study in the superconducting silicon clathrate compound NaxBaySi46
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| 作成者 |
Shimizu Fumihiko
Maniwa Yutaka
Kume Kiyoshi
Kawaji Hitoshi
Ishikawa Mitsuo
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| 収録物名 |
Physical Review B - Condensed Matter and Materials Physics
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| 巻 | 54 |
| 号 | 18 |
| 開始ページ | 13242 |
| 終了ページ | 13246 |
| 抄録 |
29Si, 23Na, 137Ba, and 135Ba NMR experiments were carried out in the superconducting silicon clathrate compound NaxBaySi46 to study the electronic states above the superconducting transition temperature. We observed three distinct 29Si signals with different Knight shift (2036, 862, and 720 ppm at 90 K with a small temperature dependence of ∼10%), which were ascribed to inequivalent Si sites in the Si46 structure. The results indicate that the conduction-electron spin and/or charge density is strongly site-dependent. At all the atomic sites, the Korringa relation in NMR relaxation was observed, indicative of metallic electronic structure with moderate electronic correlation. The Na and Ba atoms are partially ionized in NaxBaySi46, which shows the noticeable difference from the system of alkali-metal-doped fullerides. The comparison with band calculations is discussed.
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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 | 1996-11-01 |
| 権利情報 |
Copyright (c) 1996 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] http://dx.doi.org/10.1103/PhysRevB.54.13242
[DOI] 10.1103/PhysRevB.54.13242
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