Low-temperature 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, KharkovS. V. StartsevPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
ABI
Abstract
The thermal conductivity of the layered crystal CsDy(MoO4)2 has been studied experimentally in a direction parallel to the plane of the layers, along the crystallographic b axis in the temperature range 2−90 K. Some specific features of the temperature dependence of the specimen’s conductivity on increasing the temperature were revealed: a sharp suppression of the phonon heat transport in the vicinity of the first-order phase transition with Tc = 42.03 K and the maintenance of a constant thermal conductivity up to 90 K. It is suggested that the results obtained are associated with additional mechanisms for phonon scattering arising above Tc: by defects, represented by the paramagnetic dysprosium ions and also by structural inhomogeneities.
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