Peculiarities of low-temperature lattice dynamics of layered crystals CsR(MoO4)2 (R = Dy, Gd)
E. AndersB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, KharkovS. V. StartsevB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, KharkovI. N. KudryavtsevState University, KharkovК. Э. НемченкоState University, Kharkov
ABI
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The results of investigations of the low-temperature heat capacity of layered crystals CsDy(MoO4)2 and CsCd(MoO4)2 in the temperature range from 2.5 to 40 K are considered. Various theoretical approaches used for describing the lattice heat capacity of layered crystals with a complex lattice are analyzed. A model taking into account optical phonons along with acoustic phonons is proposed. Various parameters of the phonon subsystem in the crystals under investigation are determined.
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