Anisotropic Magnetocaloric Effect in Single-crystalline Pr0.52Sr0.48MnO3

Abstract

We report the magnetocaloric effect (MCE) in a Pr0.52Sr0.48MnO3 single crystal estimated from the isothermal magnetization curve using the Maxwell relation. Isothermal magnetization curves are measured over the range 20 K to 320 K where the field was applied parallel (‖) and perpendicular (⊥) to the [110] direction of the perovskite structure with Pbnm space group. A peak in the temperature (T) dependence of magnetic entropy change (ΔS M) with a fairly large negative value (≈−3.3 J/kg K) is observed at 275 K close to the Curie temperature (T C) for a change in field of ΔH=40 kOe. The ‖ and ⊥ components of ΔS M deviate from each other below ∼260 K and an inverse MCE is observed below ∼150 K. We note that the Landau theory of phase transitions satisfactorily explains the ΔS M vs T plot around the second-order transition at T C.