Abstract Magnetocaloric effect (MCE) is a thermodynamic response of the coupling effect between the magnetic sub-lattice(s) with applied magnetic fields, which is strongly correlated with the corresponding magnetic transition. In this work, the magnetic properties, magnetic phase transition, MCE and critical behavior of the paramagnetic (PM) to ferromagnetic (FM) transition in double perovskite RE2CrMnO6 (RE = La, Pr, and Nd) compounds are investigated. The double perovskite compounds reveal a second-ordered magnetic phase transition around TC of 112, 93, and 80 K for RE of La, Pr, and Nd, respectively. The corresponding values of peak magnetic entropy change (-ΔSMmax) around TC are 1.31, 1.86, and 2.23 J kg−1K−1 under the ΔH of 0–7 T. Moreover, the critical exponent study was conducted to probe the nature of critical behavior around the PM to FM transition by the modified Arrott plot (MAP), Kouvel-Fisher (K–F), ΔH dependence of -ΔSMmax, and universal scaling hypothesis methods. The evaluated reliable critical exponents (β, γ, and δ) data for RE2CrMnO6 (RE = La, Pr, and Nd) follows the mean-field theory model, proving the existence of long-range FM orders in these double-perovskite oxide compounds.

中文翻译：

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双钙钛矿 RE2CrMnO6（RE = La、Pr 和 Nd）化合物的磁热特性和临界行为

摘要 磁热效应（MCE）是磁亚晶格与外加磁场之间耦合效应的热力学响应，与相应的磁跃迁密切相关。在这项工作中，研究了双钙钛矿 RE2CrMnO6（RE = La、Pr 和 Nd）化合物的磁性、磁性相变、MCE 和顺磁性 (PM) 到铁磁性 (FM) 转变的临界行为。双钙钛矿化合物显示了 La、Pr 和 Nd 的稀土元素在 TC 附近的二阶磁相变分别为 112、93 和 80 K。在 0-7 T 的 ΔH 下，TC 附近的峰值磁熵变 (-ΔSMmax) 的对应值为 1.31、1.86 和 2.23 J kg-1K-1。此外，进行了临界指数研究，通过修改后的阿罗特图 (MAP)、Kouvel-Fisher (K-F)、-ΔSMmax 的 ΔH 依赖性和通用标度假设方法来探测 PM 到 FM 转变的临界行为的性质。RE2CrMnO6（RE = La、Pr 和 Nd）的评估可靠临界指数（β、γ 和 δ）数据遵循平均场理论模型，证明这些双钙钛矿氧化物化合物中存在长程 FM 阶次.