Lattice dynamics and anomalous softening in the YbFe4Sb12 skutterudite
Creators
- 1. Julich Center for Neutron Science, Julich (Germany)
- 2. European Synchrotron Radiation Facility, Grenoble (France)
- 3. Oak Ridge National Laboratory, TN (United States)
- 4. Tbilisi State University, Tbilisi (Georgia)
- 5. University of Tennessee, Knoxville, TN (United States)
- 6. Forschungszentrum Julich, Julich (Germany)
Description
The lattice dynamics of the filled skutterudite YbFe4Sb12 was studied by resonant ultrasound spectroscopy and an anomalous softening in the temperature dependence of the elastic constants at ∼50 K was observed. This anomaly can not be explained by the dynamics of the filler, in contrast to other filled skutterudites. We have further investigated the origin of this anomaly using macroscopic and microscopic measurements. A rearrangement of the spectral weight of the Yb phonon states was observed in the temperature dependence of the density of phonon states, obtained by inelastic neutron scattering. We suggest that the anomaly is due to a change of the Yb valence state and that the anomaly and the phonon spectral weight rearrangement have the same origin.
Additional details
Identifiers
Publishing Information
- Journal Title
- Physical Review. B, Condensed Matter and Materials Physics
- Journal Volume
- 84
- Journal Issue
- 18
- Journal Page Range
- p. 184306
- ISSN
- 1098-0121
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 43023931
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Descriptors DEI
- NEUTRONS; ORIGIN; PHONONS; SCATTERING; SPECTROSCOPY; TEMPERATURE DEPENDENCE; VALENCE
- Descriptors DEC
- BARYONS; ELEMENTARY PARTICLES; FERMIONS; HADRONS; NUCLEONS; QUASI PARTICLES
Optional Information
- Contract/Grant/Project number
- KC0202020; ERKCS82; AC05-00OR22725
- Notes
- 9 pages; doi 10.1103/PhysRevB.84.184306
- Funding organization
- SC USDOE - Office of Science (United States)