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ID 16650
file
creator
Fang, S. L.
Grigorian, L.
Ekkund, P. C.
Dresselhaus, G.
Dresselhaus, M. S.
Kawaji, H.
NDC
Physics
abstract
Room-temperature Raman-scattering spectra are reported for the type-II superconductors MxBaySi46 (M =Na,K) that were recently shown to exhibit Tc's ∼3.5 K. These spectra are compared to those of Na8Si46 and K7Si46 clathrates that exhibit normal metallic behavior down to 2 K. In the Si46 system, fifteen of the eighteen Si related first-order Raman frequencies predicted by group theory have been detected, and the frequencies are found to be sensitive to the particular dopants. The Raman linewidths observed for the MxBaySi46 system are comparable to those observed for Na8Si46 and K7Si46. The data, taken collectively, suggest that the line broadening in the metallic Si clathrates is due to important contributions from both the electron-phonon interaction as well as from a random filling of the Si cages and charge-transfer disorder.
journal title
Physical Review B - Condensed Matter and Materials Physics
volume
Volume 57
issue
Issue 13
start page
7686
end page
7693
date of issued
1998-04-01
publisher
American Physical Society
issn
1098-0121
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 1998 American Physical Society
relation url
department
Graduate School of Engineering