Magnetocaloric effect of an antiferromagnetic ErAl2Ge2 single crystal
Magnetocaloric effect of an antiferromagnetic ErAl2Ge2 single crystal
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反铁磁 ErAl2Ge2 单晶的磁热效应
DOI：
10.1016/j.jmmm.2021.168014
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发表时间：
2021-04
影响因子：
2.7
通讯作者：
Zhang Zhidong
中科院分区：
文献类型：
--
作者：
Gao Fei;Ren Weijun;Zhuang Yanxin;Zhao Xinguo;Li Bing;Zhang Zhidong
磁热效应（MCE）是磁性材料在施加和去除磁场时的熵变，为传统气体循环以外的制冷提供了另一种途径。在这项工作中，我们报道了反铁磁化合物ErAl2Ge2的大MCE。各向同性eral2ge2粉末在0 ~ 70 kOe的磁场变化下，磁熵变化最大值为- 19.52 J/kg K。当磁场方向与ab面平行时，该值增加到- 24.84 J/kg K。利用eral2ge2晶体MCE的各向异性，可以得到较大的旋转磁熵变化，当h = 20 kOe时为- 6.30 J/kg K，当h = 40 kOe时为- 9.03 J/kg K。因此，单晶或纹理化的eral2ge2可以用作旋转磁制冷机的制冷剂，这是一种结构简单的磁冷却系统。
The magnetocaloric effect (MCE) is the entropy change in magnetic materials upon application and removal of magnetic fields, providing an alternative path for refrigeration other than conventional gas cycles. In this work, we report a large MCE of the antiferromagnetic compound ErAl2Ge2. The maximum magnetic-entropy change is −19.52 J/kg K under a magnetic field change of 0–70 kOe for isotropic ErAl2Ge2powder. This value increases to −24.84 J/kg K for a single crystal when the direction of the magnetic fieldHis parallel to theab-plane. By using the anisotropy of the MCE of an ErAl2Ge2crystal, large rotating magnetic-entropy changes of −6.30 J/kg K forH= 20 kOe and −9.03 J/kg K forH= 40 kOe can be obtained. Thus, a single crystal or textured ErAl2Ge2may be used as the refrigerant of a rotating magnetic refrigerator, a magnetic cooling system with a simple structure.