Magnetocaloric properties of single crystalline YbTiO3 with second order phase transition

Abstract

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 TC (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.