Abstract
The specific heat C(T) of the monoclinic RbDy(WO 4 ) 2 crystal has been studied at very low temperatures 0.2≤T≤1.9 K and in magnetic fields 0≤H≤0.38 T. The Neel temperature was shown to be equal to TN = 0.818 ± 0.005 K. The experimental value of the effective exchange parameter was obtained to be equal to J/k = − 0.798 K. The C T) dependence below Neel temperature 0.5TN<T<0.99TN ) is well described by 2D Ising model, whereas in the temperature region close above TN (1.01 TN<T< 2TN) it can be described by neither 2D, nor 3D Ising model. The experimental and theoretical H-TN diagrams for field H ‖ a are in a reasonable agreement for simple quadratic lattice.
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Borowiec, M.T., Dyakonov, V.P., Jedrzejczak, A. et al. Magnetic Ordering of Dy3+ Ions in RbDy(WO4)2 Single Crystal. Journal of Low Temperature Physics 110, 1003–1011 (1998). https://doi.org/10.1023/A:1022308115255
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DOI: https://doi.org/10.1023/A:1022308115255