Comparative investigation of temperature-induced phonon-frequency shifts in CeSn 3 and LaSn 3 (original) (raw)

Physical Review B, 1987

Abstract

ABSTRACT Phonon frequencies of longitudinal- and transverse-acoustic modes have been determined in the mixed-valence compound CeSn3 at 295 and 10 K. For comparison, temperature-induced phonon-frequency shifts were also measured in the integral-valence isostructural compound LaSn3. No evidence has been found that the mixed valence significantly alters the lattice dynamics of CeSn3 as a function of temperature. The difference between the thermal expansion coefficients of CeSn3 and LaSn3 below room temperature is in agreement with differences in the respective mode Grüneisen parameters of the two substances.

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