Thermal Conductivity of a Layered CsGd(MoO4)2 Crystal

K. Tibenskáa, V. Tkáčb, A. Orendáčováb, M. Orendáčb, A. Feherb, J. Šebekc and V. Sechovskýd aFaculty of Aeronautics, Technical University, Rampová 7, 041 21 Košice, Slovak Republic bInstitute of Physics, P.J. Šafárik University, Park Angelinum 9, 040 00 Košice, Slovak Republic cInstitute of Physics AS CR, Na Slovance 2, 18221 Prague, Czech Republic dCharles University in Prague, Faculty of Mathematics and Physics, Ke Karlovu 5, 12116 Prague, Czech Republic

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The thermal conductivity of CsGd(MoO4)2 has been studied in the temperature range from 2 to 50 K in zero magnetic field. The analysis of the data performed within the Debye model with the relaxation-time approximation revealed the presence of the scattering of phonons by critical fluctuations. The behaviour of phonon mean free path at the lowest temperatures is discussed.

DOI: 10.12693/APhysPolA.118.971 PACS numbers: 75.30.Et, 75.40.Cx, 66.70.Lm, 75.30.Ds