Phonon frequencies and linewidths for Sm(Y)S

Journal Article · Mon Dec 15 04:00:00 EST 1980 · Phys. Rev., B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.22.5833· OSTI ID:7038937

Wakabayashi, N

The monopolar charge fluctuation model of lattice dynamics has been extended by including the relaxation in the electronic system. The extension introduces wave-vector-dependent lifetimes only in the longitudinal phonons. This phenomenological model involving eight parameters has been applied to the analysis of the neutron scattering data on the phonons of the mixed-valence compound, Sm/sub 0.75/Y/sub 0.25/S. The calculated phonon frequencies and linewidths are in good agreement with the data. The relaxation time has been found to be about 4 x 10/sup -14/ sec which seems to be consistent with the narrow bandwidth for the f electrons in this compound.

• Research Organization: Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 7038937
• Journal Information: Phys. Rev., B: Condens. Matter; (United States), Journal Name: Phys. Rev., B: Condens. Matter; (United States) Vol. 22:12; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
BAND THEORY
CHALCOGENIDES
ELECTRONIC STRUCTURE
ENERGY LEVELS
F STATES
LATTICE VIBRATIONS
LINE WIDTHS
PHONONS
QUASI PARTICLES
RARE EARTH COMPOUNDS
RELAXATION
SAMARIUM COMPOUNDS
SAMARIUM SULFIDES
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VALENCE
YTTRIUM COMPOUNDS
YTTRIUM SULFIDES