Magnetocaloric effect in a diluted ferroelectric: Ba0.6 Eu0.4TiO3

Abstract

We measured the magnetization (M) and heat capacity (Cp) in the perovskite ferroelectric BaTiO3 wherein 40 % Ba site is replaced by magnetic Eu²⁺ (4f⁷, S = 7/2) ions. The temperature dependence of M and Cp suggest that Ba0.6Eu0.4TiO3- is paramagnetic at and above 2.5 K. Isothermal magnetization and heat capacity data were used to estimate isothermal magnetic entropy change \left(\DeltaS_{\mathrm {m \right) and adiabatic temperature change. It is found that this magneto-ferroelectric compound exhibits and adiabatic temperature change. It is found that this magneto-ferroelectric compound exhibits 16.2 K as the field is changed from 0 T to 7 T, which suggests that this compound could be a potential candidate for cryogenic magnetic cooling.