[en] The europium partial vibrational density of states (DOS) in EuFe4Sb12 and the iron partial vibrational DOS in both EuFe4Sb12 and (CeFe4Sb12)-Fe-57 have been obtained by nuclear inelastic scattering. The results reveal the strong independence of the iron and rare-earth vibrational modes. The cage filling europium only participates significantly to the low-energy local vibrational modes. The force constants have been obtained from the measured probability of nuclear absorption. The energies of the peaks in the europium and iron DOS are in excellent agreement with the calculated DOS in LaFe4Sb12. The results indicate that nuclear inelastic scattering is the technique of choice for the study of the localized vibrational modes in thermoelectric "phonon glass" materials.
Disciplines :
Physics
Author, co-author :
Long, G. J.
Hermann, Raphaël ; Université de Liège - ULiège > Département de physique > Département de physique
Grandjean, Fernande ; Université de Liège - ULiège > Département de physique > Département de physique
Alp, E. E.
Sturhahn, W.
Johnson, C. E.
Brown, D. E.
Leupold, O.
Ruffer, R.
Language :
English
Title :
Strongly decoupled europium and iron vibrational modes in filled skutterudites
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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