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Magnetic and magnetocaloric properties of Dy5Pd2: role of magnetic irreversibility

机译：Dy5Pd2的磁性和磁热性质：磁性不可逆的作用

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摘要

In this report the magnetic behavior and magnetocaloric response of the intermetallic compound Dy5Pd2 has been investigated from detailed magnetization measurements. Magnetic cluster glass behavior has been observed in the crystalline Dy5Pd2 compound below 38 K. Magnetocaloric entropy changes evaluated using Maxwell's relation (MXR) from zero-field-cooled magnetization isotherms, which is used mostly in the literature, shows a giant inverse magnetocaloric effect (MCE) below 20 K and a large conventional MCE around 60 K in this compound. The observed value of inverse MCE is similar to 29 J kg(-1) K-1 for 50 kOe external magnetic field change at T = 3.5 K. In this context, the origin of the giant inverse MCE and its temperature dependence has been studied. The applicability of MXR and procedure to obtain reversible MCE using MXR which is important for practical application has been discussed. Dy5Pd2 exhibits a reversible MCE with a peak value of magnetic entropy change (Delta S-M(max)) 8.3 J kg(-1) K-1 at 60 K under a magnetic field of 50 kOe and an irreversible inverse MCE below 20 K.
机译：在本报告中，已通过详细的磁化测量研究了金属间化合物Dy5Pd2的磁行为和磁热响应。在低于38 K的结晶Dy5Pd2化合物中观察到磁簇玻璃的行为。使用零场冷却磁化等温线的麦克斯韦关系（MXR）评估了磁热熵的变化，这在文献中主要使用，它显示出巨大的逆磁热效应（ MCE）低于20 K，而该化合物中的大型常规MCE约为60K。逆MCE的观测值与T = 3.5 K时50 kOe外部磁场变化的29 J kg（-1）K-1相似。在此背景下，研究了巨型逆MCE的起源及其温度依赖性。讨论了MXR的适用性和使用MXR获得可逆MCE的过程，这对实际应用很重要。 Dy5Pd2表现出可逆的MCE，其在50 kOe的磁场下在60 K时的磁熵变（Delta S-M（max））8.3 J kg（-1）K-1的峰值和在20 K以下的不可逆MCE。

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