Large Magnetocaloric effect and magnetic phase transitions in Nd2NiMnO6
Abstract
We present combined experimental and theoretical investigations on the magnetic and magnetocaloric behavior of Nd2NiMnO6. The relative cooling power (RCP) which quantifies the usefulness of a magnetocaloric (MC) material is estimated to be ≈ 300 J/Kg near the ferromagnetic transition at TC ≈ 195 K. This RCP is comparable to the best known MC materials. Additionally, the magnetic entropy change has a broad profile (TC - 50~ K < T < TC + 50~ K) leading to an enhancement in the working-range of temperatures for magnetocaloric based cooling. These features make Nd2NiMnO6 a superior magnetocaloric material compared for example, to the nonmagnetic counterpart Y2NiMnO6. We identify the mechanism for the enhanced RCP which can guide search for future MC materials.
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