The results of the experimental studies of the temperature dependence of the normalized Gruneisen parameter for cadmium diphosphide single crystal in the field of commensurate-incommensurate phase transition are presented. Measurements were made using laser photoacoustic method with harmonic excitation and piezoelectric registration in the temperatures interval of 280-330 K. Anomalies of the temperature dependence of the amplitude of the photoacoustic signal is proportional to the Gruneisen parameter were observed in the temperature range of 305-322 K. These anomalies are associated with the occurrence of phase transitions from commensurate to incommensurate phase. The estimation of the temperature dependence of the normalized Gruneisen parameter using literature data and comparison with experimental data were made.
Department of Acoustics, Faculty of Physics, M.V. Lomonosov Moscow State University. Moscow 119991, Leninskie gory 1-2, Russia.
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