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在MnCo(1-x)Zn(x)Ge中调节结构不稳定性以增强室温附近的磁热效应。

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

作者信息

Choudhury D, Suzuki T, Tokura Y, Taguchi Y

机构信息

RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan.

1] RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan [2] Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.

出版信息

Sci Rep. 2014 Dec 18;4:7544. doi: 10.1038/srep07544.

DOI:10.1038/srep07544
PMID:25519919
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4269893/
Abstract

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 MnCo(1-x)Zn(x)Ge 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.

摘要

磁热效应是指通过施加磁场来诱导磁性材料温度变化的现象。这种效应可应用于环境友好型磁制冷技术。在此，我们展示了磁场诱导的结构不稳定性在增强MnCo(1-x)Zn(x)Ge合金（x = 0 - 0.05）磁热效应方面的关键作用。x的增加会迅速降低马氏体转变温度，同时使铁磁转变保持在室温附近。在x = 0.03附近微调x会导致在冷却过程中伴随结构和铁磁转变，从而产生增强的磁热效应以及磁场诱导的结构转变。根据朗道自由能唯象学对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依赖性，指出了磁结构耦合对于高性能磁热材料设计的重要性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6636/4269893/224068fd1b08/srep07544-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6636/4269893/a0de24d457a8/srep07544-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6636/4269893/014f57dbccb4/srep07544-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6636/4269893/53c8d04f03fc/srep07544-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6636/4269893/224068fd1b08/srep07544-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6636/4269893/a0de24d457a8/srep07544-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6636/4269893/014f57dbccb4/srep07544-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6636/4269893/53c8d04f03fc/srep07544-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6636/4269893/224068fd1b08/srep07544-f4.jpg

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