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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Title ( eng )
Vibrational modes in silicon clathrate compounds: A key to understanding superconductivity
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.
Source Title
Physical Review B - Condensed Matter and Materials Physics
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.
NDC
Physics [ 420 ]
Language
eng
Resource Type journal article
Publisher
American Physical Society
Date of Issued 2002-07-01
Rights
Copyright (c) 2002 American Physical Society
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