Tuning structural instability toward enhanced magnetocaloric effect around room temperature in MnCo(1-x)Zn(x)Ge.

Tuning structural instability toward enhanced magnetocaloric effect around room temperature in MnCo(1-x)Zn(x)Ge.
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DOI:
10.1038/srep07544
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发表时间:
2014-12-18
期刊:
影响因子:
4.6
通讯作者:
Taguchi Y
Taguchi Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Choudhury D;Suzuki T;Tokura Y;Taguchi Y

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磁热效应是通过施加磁场而引起磁性材料温度变化的现象。这种效应可以应用于环境友好的磁制冷技术。在这里,我们展示了磁场引起的结构不稳定性在增强 MnCo1−xZnxGe 合金 (x = 0–0.05) 磁热效应方面的关键作用。 x 的增加迅速降低了马氏体转变温度,同时将铁磁转变保持在室温附近。在 x = 0.03 附近微调 x 会导致冷却过程中伴随的结构和铁磁转变,从而增强磁热效应以及磁场诱导的结构转变。根据朗道自由能现象学对 T-H 平面中的结构相图进行分析,解释了所观察到的磁热效应的特征 x 相关性,指出了磁结构耦合对于高性能磁热学设计的重要性。
Magnetocaloric effect is the phenomenon that temperature change of a magnetic material is induced by application of a magnetic field. This effect can be applied to environmentally-benign magnetic refrigeration technology. Here we show a key role of magnetic-field-induced structural instability in enhancing the magnetocaloric effect for MnCo1−xZnxGe alloys (x = 0–0.05). The increase in x rapidly reduces the martensitic transition temperature while keeping the ferromagnetic transition around room temperature. Fine tuning of x around x = 0.03 leads to the concomitant structural and ferromagnetic transition in a cooling process, giving rise to enhanced magnetocaloric effect as well as magnetic-field-induced structural transition. Analyses of the structural phase diagrams in the T-H plane in terms of Landau free-energy phenomenology accounts for the characteristic x-dependence of the observed magnetocaloric effect, pointing to the importance of the magnetostructural coupling for the design of high-performance magnetocalorics.
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