Large magnetic entropy change in the metallic antiperovskite Mn3GaC
Large magnetic entropy change in the metallic antiperovskite Mn3GaC
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DOI：
10.1063/1.1574591
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发表时间：
2003-05
影响因子：
3.2
通讯作者：
Ming-hui Yu;L. H. Lewis;A. Moodenbaugh
中科院分区：
文献类型：
--
作者：
Ming-hui Yu;L. H. Lewis;A. Moodenbaugh
在金属反钙钛矿Mn3GaC的一阶变磁温度159 K附近，观察到一个较大的正磁熵变化ΔSM，该化学测量化合物从反铁磁态转变为倾斜铁磁态，并伴有- 0.46%的不连续体积变化，但没有改变对称性。Mn3GaC的ΔSM不同寻常的场依赖性在小于1 t的场间隔内从零到饱和值呈极快的线性增长，随着场变化的增加，ΔSM的峰值向低温变宽，形成了MCE的温度依赖性ΔSM平台，这对这些材料在ericcon循环磁制冷机中的实际应用具有重要意义。
A large positive magnetic entropy change ΔSM is observed in the metallic antiperovskite Mn3GaC near its first-order metamagnetic transition temperature 159 K where the stoichiometric compound transforms from an antiferromagnetic to a canted ferromagnetic state accompanied by a discontinuous volume change of −0.46% without change of symmetry. The unusual field dependence of the ΔSM of Mn3GaC shows a very rapid linear increase from zero to a saturation value within a field interval smaller than 1 T. The broadening of the peak of ΔSM to low temperature with increasing field change creates an ΔSM plateau in the temperature dependence of the MCE, which is of significance for practical application of these materials in the Ericsson-cycle magnetic refrigerator.