Neutron and Nuclear Inelastic Scattering Study of the Einstein Oscillators in Ba-, Sr-, and Eu-filled Germanium Clathrates

Author

Raphaël P. Hermann
Werner Schweika
Olaf Leupold
Rudolf Rüffer
George S. Nolas
Fernande Grandjean, Missouri University of Science and TechnologyFollow
Gary J. Long, Missouri University of Science and TechnologyFollow

Abstract

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±0.1meV, 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±1.2meV 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 9meV.

Recommended Citation

R. P. Hermann et al., "Neutron and Nuclear Inelastic Scattering Study of the Einstein Oscillators in Ba-, Sr-, and Eu-filled Germanium Clathrates," Physical review B: Condensed matter and materials physics, vol. 72, no. 17, American Physical Society (APS), Nov 2005.

The definitive version is available at https://doi.org/10.1103/PhysRevB.72.174301

Department(s)

Chemistry

International Standard Serial Number (ISSN)

1098-0121

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2005 American Physical Society (APS), All rights reserved.

Publication Date

01 Nov 2005