Giant room-temperature magnetocaloric effect in Mn1−xCrxAs
Giant room-temperature magnetocaloric effect in Mn1−xCrxAs
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DOI：
10.1063/1.2884524
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发表时间：
2008-02
影响因子：
4
通讯作者：
N. Sun;W. Cui;Li Duoli;D. Geng;F. Yang;Zhidong Zhang
中科院分区：
文献类型：
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作者：
N. Sun;W. Cui;Li Duoli;D. Geng;F. Yang;Zhidong Zhang
在室温下观察到了x=0.006和0.01Mn1−xCrxAs化合物的巨磁热效应。掺铬降低(甚至消除)了MnAs的大热滞，同时使Mn0.99Cr0.01As的一级转变温度从313K降低到265K。在居里温度附近，磁场诱导了铁磁六方相向顺磁正交相的一级相变，使得Mn0.99Cr0.01As的ΔSM在267K时的最大值为20.2J/kgK。对Mn1−xCrxAs系统的研究可能为寻找合适的室温磁制冷材料开辟一个重要的领域。
A giant magnetocaloric effect was observed at room temperature in Mn1−xCrxAs compounds with x=0.006 and 0.01. The Cr dopant reduces (or even eliminates) the large thermal hysteresis of MnAs, while it lowers the first-order transition temperature from 313K for MnAs to 265K for Mn0.99Cr0.01As. Near the Curie temperature, a magnetic field induces a first-order phase transition from a ferromagnetic hexagonal phase to a paramagnetic orthorhombic phase, leading to a maximum value of ΔSM of 20.2J∕kgK at 267K for a 5T field change for Mn0.99Cr0.01As. The study on the Mn1−xCrxAs system may open an important field in searching proper materials for room-temperature magnetic refrigeration.