Large room-temperature magnetocaloric effects in Fe0.8Mn1.5As
Large room-temperature magnetocaloric effects in Fe0.8Mn1.5As
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DOI：
10.1063/1.2784170
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发表时间：
2007-09
影响因子：
4
通讯作者：
Nanhai Sun;S. Ma;Qiang Zhang;Juan Du;Zhidong Zhang
中科院分区：
文献类型：
--
作者：
Nanhai Sun;S. Ma;Qiang Zhang;Juan Du;Zhidong Zhang
在Fe0.8Mn1.5As化合物中，外加磁场诱导了反铁磁相向亚铁磁相的亚磁转变，在室温附近产生了较大的磁热效应。化合物中的熵变ΔSM的符号出人意料地为负，而不是表现出相反的磁热效应，揭示了一种不同的机制。当磁场变化5T时，在287.5K时，ΔSM的最大值为6.2J/kgK。研究具有反铁磁性相关的变磁相变的体系可能会为寻找优良的室温磁制冷材料开辟一个重要的领域。
In Fe0.8Mn1.5As compound, an external magnetic field induces a metamagnetic transition from an antiferromagnetic phase to a ferrimagnetic phase above Ts=285K, leading to large magnetocaloric effects around room temperature. Instead of showing inverse magnetocaloric effects, the sign of the entropy change ΔSM in the compound is unexpectedly negative, revealing a different mechanism. The maximum value of ΔSM is 6.2J∕kgK at 287.5K for a magnetic field change of 5T. The study on systems with antiferromagnetism-related metamagnetic transitions may open an important field in searching good materials for room-temperature magnetic refrigeration.