Cryogenic magnetic properties and magnetocaloric effects (MCE) in B-site disordered RE2CuMnO6 (RE = Gd, Dy, Ho and Er) double perovskites (DP) compounds

Abstract

In this paper, a detailed investigation with respect to the structural, cryogenic magnetic properties and magnetocaloric performances of RE2CuMnO6 (RE = Gd, Dy, Ho and Er) double perovskite (DP) compounds has been performed. All the RE2CuMnO6 compounds are confirmed to B-site disordered and crystallized in the GdFeO3-type structure (Pnma space group, N 62, oP20). The magnetic transition temperatures (TM) are found to be ~7.5 K for Gd2CuMnO6, ~12.1 K for Dy2CuMnO6, ~12.2 K for Ho2CuMnO6, and ~3.6 K for Er2CuMnO6, respectively. Moreover, for checking the magnetocaloric performances several vital parameters including -ΔSMmax (peak value of magnetic entropy change, -ΔSM), TEC (3) (temperature averaged -ΔSM) and RCP (relative cooling powers) are evaluated to be 7.84, 7.73 J/kgK and 151.1 J/kg for Gd2CuMnO6, 5.69, 5.59 J/kgK and 180.9 J/kg for Dy2CuMnO6, 7.12, 7.05 J/kgK and 192.4 J/kg for Ho2CuMnO6, as well as 9.92, 9.60 J/kgK and 195.9 J/kg for Er2CuMnO6 under the magnetic field change ΔH = 5 T, respectively.