Rare-earth tuned magnetism and magnetocaloric effects in double perovskites $R_2$NiMnO$_6$

We present a comprehensive experimental study of magnetization and magnetocaloric effect (MCE) in double perovskite (DP) materials $R_{2}$ NiMnO $_{6}$ with $R =$ Pr, Nd, Sm, Gd, Tb, and Dy. While a paramagnetic to ferromagnetic transition, with T $_{C}$ in the range $\sim 100 - 200$ K, is a common feature that can be attributed to the ordering of Mn $^{4 +}$ and Ni $^{2 +}$ magnetic moments, qualitatively distinct behavior depending on the choice of $R$ is observed at low temperatures. These low-temperature anomalies in magnetization are also manifest in the change in magnetic entropy, $-\Delta S_{M} $, w h o s e s i g n d e p e n d s o n t h e c h o i c e o f$ R$. In order to understand these results, we present theoretical analysis based on mean-field approximation and Monte Carlo simulations on a minimal spin model. The model correctly captures the key features of the experimental observations.

Rare-earth tuned magnetism and magnetocaloric effects in double perovskites $R_{2}$ NiMnO $_{6}$

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Rare-earth tuned magnetism and magnetocaloric effects in double perovskites $R_{2}$ NiMnO $_{6}$

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Rare-earth tuned magnetism and magnetocaloric effects in double perovskites R2R2​NiMnO66​

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Rare-earth tuned magnetism and magnetocaloric effects in double perovskites R2R2​NiMnO66​

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Rare-earth tuned magnetism and magnetocaloric effects in double perovskites $R_{2}$ NiMnO $_{6}$

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Rare-earth tuned magnetism and magnetocaloric effects in double perovskites $R_{2}$ NiMnO $_{6}$

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