Vacancy-tuned paramagnetic/ferromagnetic martensitic transformation in Mn-poor Mn1-xCoGe alloys

被引：182

作者：

Liu, E. K. ^{[1
]}

Zhu, W. ^{[1
]}

Feng, L. ^{[1
]}

Chen, J. L. ^{[1
]}

Wang, W. H. ^{[1
]}

Wu, G. H. ^{[1
]}

Liu, H. Y. ^{[2
]}

Meng, F. B. ^{[2
]}

Luo, H. Z. ^{[2
]}

Li, Y. X. ^{[2
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[2] Hebei Univ Technol, Sch Mat Sci & Engn, Tianjin 300130, Peoples R China

来源：

EPL | 2010年 / 91卷 / 01期

基金：

中国国家自然科学基金;

关键词：

MAGNETIC-PROPERTIES; COXNI1-XMNGE SYSTEM; CRYSTAL-STRUCTURE; TRANSITION; TEMPERATURE; GERMANIDES; SILICIDES; DEFECTS; COMNGE;

D O I：

10.1209/0295-5075/91/17003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

It is shown that a temperature window between the Curie temperatures of martensite and austenite phases around the room temperature can be obtained by a vacancy-tuning strategy in Mn-poor Mn1-xCoGe alloys (0 <= x <= 0.050). Based on this, a martensitic transformation from paramagnetic austenite to ferromagnetic martensite with a large magnetization difference can be realized in this window. This gives rise to a magnetic-field-induced martensitic transformation and a giant magnetocaloric effect in the Mn1-xCoGe system. The decrease of the transformation temperature and of the thermal hysteresis of the transformation, as well as the stable Curie temperatures of martensite and austenite, are discussed on the basis of the Mn-poor Co-vacancy structure and the corresponding valence-electron concentration. Copyright (C) EPLA, 2010

引用

页数：5

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