NMR study in the superconducting silicon clathrate compound NaxBaySi46
Physical Review B - Condensed Matter and Materials Physics Volume 54 Issue 18
Page 13242-13246
published_at 1996-11-01
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| File | |
| Title ( eng ) |
NMR study in the superconducting silicon clathrate compound NaxBaySi46
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| Creator |
Shimizu Fumihiko
Maniwa Yutaka
Kume Kiyoshi
Kawaji Hitoshi
Ishikawa Mitsuo
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| Source Title |
Physical Review B - Condensed Matter and Materials Physics
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| Volume | 54 |
| Issue | 18 |
| Start Page | 13242 |
| End Page | 13246 |
| Abstract |
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 |
Physics [ 420 ]
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| Language |
eng
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| Resource Type | journal article |
| Publisher |
American Physical Society
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| Date of Issued | 1996-11-01 |
| Rights |
Copyright (c) 1996 American Physical Society
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| Publish Type | Version of Record |
| Access Rights | open access |
| Source Identifier |
[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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