GdCrO3: a potential candidate for low temperature magnetic refrigeration
GdCrO3: a potential candidate for low temperature magnetic refrigeration
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DOI：
10.1088/1361-6463/aacc98
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发表时间：
2018-08-01
影响因子：
3.4
通讯作者：
Topwal, D.
中科院分区：
文献类型：
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作者：
Mahana, Sudipta;Manju, U.;Topwal, D.
对多晶GdCrO_3的详细磁学研究显示了一系列有趣的特征，如温度诱导磁化反转、自旋翻转和自旋重取向等，这些特征是由于Cr和Gd-亚晶格内部和之间的竞争磁相互作用引起的。它还表现出巨大的磁热效应，其最大熵变为36.97J kg(-1)K-1，绝热温变为19.12K，低温场变7T时的致冷量为542J kg(-1)。如此大的磁致冷效率除了Gd有序化外，还有与抑制自旋重取向转变相关的自旋熵的抑制，这使得它成为所有已知的潜在低温磁制冷剂中最好的磁制冷候选材料之一。
Detailed magnetic studies of polycrystalline GdCrO3 show a spectrum of interesting features, such as temperature induced magnetization reversal, spin flipping and spin reorientation, etc, which arise due to the competing magnetic interactions within and between Cr and Gd-sublattices. It also exhibits a giant magnetocaloric effect (MCE) with a maximum entropy change of 36.97 J kg(-1) K-1, an adiabatic temperature change of 19.12 K and a refrigeration capacity of 542 J kg(-1) for a field change of 7 T at low temperatures. Such an exceptionally large MCE arises from the suppression of the spin entropy associated with the suppression of spin reorientation transition, in addition to the Gd-ordering, which makes it one of the best candidates for magnetic refrigeration among all known potential low temperature magnetic refrigerants.