磁热材料Dy5Pd2-xNix（x = 0和1）的玻璃态性质及R5Pd2（R = Tb，Dy，Er）的普适标度分析
Nature of glassy magnetic state in magnetocaloric materials Dy5Pd2-xNix (x = 0 and 1) and universal scaling analysis of R5Pd2 (R = Tb, Dy and Er)
摘要：
本文对Dy5Pd2和Dy5PdNi的磁性和磁热性质进行了系统的研究。我们对这些化合物的研究表明，它们表现出复杂的磁性行为，同时存在玻璃状磁性相。此外，在这些化合物的二级和一级相变，这是通过Arrott图和朗道参数分析验证。AC磁化率随着时间的依赖磁化强度的研究证实了存在的双簇玻璃状冻结在Dy5Pd2和Dy5PdNi。这些化合物显示出显着的等温熵变和相对冷却功率的值，这些值随着Ni的替代而增加。除了传统的磁热效应，在这些化合物中，注意到逆磁热效应，这可能是由于复杂的非平衡磁状态的存在而产生的。与这些化合物一起，构建了涉及R_5Pd_2家族的另外两个成员，即Er_5Pd_2和Tb_5Pd_2的通用特征曲线。主曲线证实了在这些化合物中存在二级和一级磁相变，这与我们的Arrott图和Landau参数分析的结果类似。此外，磁熵变遵循幂律，所获得的指数值表明在这些化合物中存在混合磁相互作用。
英文摘要：
We report a systematic investigation of the magnetic and magnetocaloric properties of Dy5Pd2 and Dy5PdNi. Our study on these compounds gave evidence that they exhibit complex magnetic behaviour along with the presence of glass-like magnetic phase. Furthermore, in these compounds both second order and first order phase transitions were present, which were validated through Arrott plots and Landau parameter analysis. AC susceptibility along with time dependent magnetisation study has confirmed the presence of double cluster glass-like freezing in both Dy5Pd2 and Dy5PdNi. These compounds show significant value of isothermal entropy change and relative cooling power and these values increased with Ni substitution. Beside conventional magnetocaloric effect, inverse magnetocaloric effect was noted in these compounds, which might arise due to the presence of complex non-equilibrium magnetic state. Along with these compounds a universal characteristic curve involving two other members of R5Pd2 family i.e. Er5Pd2 and Tb5Pd2 was constructed. The master curve reaffirmed the presence of both second and first order magnetic phase transition in such compounds which were in analogy to our results of Arrott plots and Landau parameter analysis. Additionally, magnetic entropy change followed the power law and the obtained exponent values indicated the presence of mixed magnetic interactions in these compounds.
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