Anomalies in the thermal conductivity of the layered crystal CsDy(MoO4)2
E. AndersPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovI. V. VolchokPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovA. I. ZvyaginPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovВ. Б. КокшеневPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovS. V. StartsevPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
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Features of the temperature dependence of the thermal conductivity ϰ(T) of the layered crystal CsDy(MoO4)2 have been studied in the temperature range 30–330 K, which includes structural phase transitions. Possible mechanisms for the origin of the practically temperature-independent behavior of ϰ(T) over a wide temperature range are discussed. A mechanism of coherent phonon scattering by electronic excitations of dysprosium ions in the high-temperature phase (Tc = 42 K) is proposed.
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