Raman scattering from vibrational modes in Si46 clathrates
Physical Review B - Condensed Matter and Materials Physics Volume 57 Issue 13
Page 7686-7693
published_at 1998-04-01
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| File | |
| Title ( eng ) |
Raman scattering from vibrational modes in Si46 clathrates
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| Creator |
Fang S. L.
Grigorian L.
Ekkund P. C.
Dresselhaus G.
Dresselhaus M. S.
Kawaji H.
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| Source Title |
Physical Review B - Condensed Matter and Materials Physics
|
| Volume | 57 |
| Issue | 13 |
| Start Page | 7686 |
| End Page | 7693 |
| 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.
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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 | 1998-04-01 |
| Rights |
Copyright (c) 1998 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.57.7686
[DOI] http://dx.doi.org/10.1103/PhysRevB.57.7686
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