Cryogenic magnetocaloric effect in distorted double-perovskite Gd2ZnTiO6

Abstract

Herein, we report on the magnetic and magnetocaloric properties of a distorted double-perovskite, Gd₂ZnTiO₆, through static magnetization and heat capacity measurements, and mean-field analysis. The most pronounced isothermal magnetic entropy change −ΔS_M, and relative cooling power RCP are found to be 53.5 J K⁻¹ kg⁻¹ and 620.6 J kg⁻¹, respectively, under a field change of 9 T at 3.1 K with a large adiabatic temperature change T_ad of 23.7 K, far exceeding the commercial cryo-coolant Gd₃Ga₅O₁₂ (GGG). The results suggest that Gd₂ZnTiO₆ is a potential working refrigerant material for the targeted liquefaction of helium.