The Influence of a Magnetic Field on the Heat Capacity of CsDy(MoO₄)₂

Abstract

Recently in some of the rare earth dimolybdates the phase transition into the complicated magnetic ordered state was observed. For example the layered crystals of K D~( M O O~)~ (Tc = 1.1 K) /l/, csDy(M00~)~ (Tc = 1.3 K) /2/, CsGd(Mo04)2 (Tc = 0.45 K) /3/ show this phase transition. This caused a

KEr(MoO4)2and CsDy(MoO4)2- Low-Dimensional Ising Magnets

“…This fact corresponds with previous specific heat studies in B = 0 indicating that the system can be described by S = 1/2 Ising model on the square lattice with J/kB = 0.56 K [7]. To estimate magnetic field dependence of CsDy(ΜοO4)2 specific heat, the results of [8] were used where the temperature dependence of specific heat in a constant magnetic field B c was studied.…”

Magnetocaloric Effect in CsDy(MoO4)2

“…4, was obtained using a relation SpB, T q S tot pB 0q ¡ |∆S M pB, T q| [15]. The expressions S tot pB 0q and |∆S M pB, T q| denote the total (lattice and magnetic) entropy, calculated from the experimental specific heat in B 0 T [11,16] and the absolute values of isothermal entropy change in applied external magnetic field, respectively. Applying the procedure depicted in Fig.…”

“…Considering the crystal symmetry and sufficiently low temperatures, the system approximates an Ising system with the effective spin 1/2 and the easy magnetization corresponding to the crystallographic a axis. Previous specific heat studies performed in zero magnetic field indicated a magnetic phase transition at T c 1.3 K, described within a 2d Ising model [11].…”