Magnetocaloric properties of single crystalline YbTiO₃ with second order phase transition

Magnetic entropy change and refrigerant capacity in applied magnetic fields up to 5 T have been investigated for the single crystalline YbTiO₃. The maximal magnetic entropy changes at the second order magnetic phase transition temperature T_C (42 K) are about 2.47 and 5.25 J kg ^-1 K^-1 under 1.5 and 5 T, respectively. The magnetic entropy change is attributed to the sharp magnetization jump, related with anomalies of the lattice parameters just at the Curie temperature. The magnetic entropy change for YbTiO₃ can be well described by a phenomenological universal curve behavior. The field dependence of the magnetic entropy change and the relative cooling power was also studied. From the analysis of the relationship between the local exponent n and the critical exponents, we conclude that the critical behavior of YbTiO₃ belongs to the three-dimensional Heisenberg class, which was also confirmed by the heat capacity measurement.