[en] Inelastic neutron scattering measurements on Ba8Ga16Ge30 and Sr8Ga16Ge30 indicate the presence of soft local modes with Einstein oscillator energies of 4.9 +/- 0.1 and 4.4 +/- 0.1 meV, modes which are associated with the lowest "rattling" mode of the Ba(B) and Sr(B) guests, respectively. Nuclear inelastic scattering measurements on Eu8Ga16Ge30 yield Einstein oscillator energies of between 3.0 +/- 0.3 and 7.5 +/- 1.2 meV for the different modes of the Eu guests. Further, the resonant character of the measurements on Eu8Ga16Ge30 reveals, without question, that neither of the Eu guests exhibit any vibrational modes above 9 meV.
Disciplines :
Physics
Author, co-author :
Hermann, Raphaël ; Université de Liège - ULiège > Département de physique > Département de physique
Schweika, W.
Leupold, O.
Ruffer, R.
Nolas, G. S.
Grandjean, Fernande ; Université de Liège - ULiège > Département de physique > Département de physique
Long, G. J.
Language :
English
Title :
Neutron and nuclear inelastic scattering study of the Einstein oscillators in Ba-, Sr-, and Eu-filled germanium clathrates
Publication date :
2005
Journal title :
Physical Review. B, Condensed Matter and Materials Physics
ISSN :
1098-0121
eISSN :
1550-235X
Publisher :
American Physical Soc, College Pk, United States - Maryland
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