Vibrational modes in silicon clathrate compounds: A key to understanding superconductivity
Physical Review B - Condensed Matter and Materials Physics Volume 66 Issue 1
Page 014532-
published_at 2002-07-01
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| File | |
| Title ( eng ) |
Vibrational modes in silicon clathrate compounds: A key to understanding superconductivity
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| Creator |
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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| Source Title |
Physical Review B - Condensed Matter and Materials Physics
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| Volume | 66 |
| Issue | 1 |
| Start Page | 014532 |
| Abstract |
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 |
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 | 2002-07-01 |
| Rights |
Copyright (c) 2002 American Physical Society
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| Publish Type | Version of Record |
| Access Rights | open access |
| Source Identifier |
[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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