Giant magnetocaloric effect and soft-mode magneto-structural phase transition in MnAs

被引：30
|
作者：
Zou, J. D. [1 ,3 ]
Wada, H. [2 ]
Shen, B. G. [1 ]
Sun, J. R. [1 ]
Li, W. [3 ]
机构：
[1] Chinese Acad Sci, Inst Phys, State Key Lab Magnetism, Beijing 100080, Peoples R China
[2] Kyushu Univ, Dept Phys, Higashi Ku, Fukuoka 8128581, Japan
[3] Cent Iron & Steel Res Inst, Funct Mat Res Inst, Beijing 100081, Peoples R China
来源：
EPL | 2008年 / 81卷 / 04期
关键词：
D O I：
10.1209/0295-5075/81/47002
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Maxwell relation and mean-field approximation are chosen to estimate the total entropy change and the magnetic entropy change, respectively. The experimental results are exactly consonant with the theoretical results. Consequently, the magnetic entropy changes make up the majority of the total entropy change, and the lattice entropy changes are small. The giant magnetocaloric effect in MnAs is clarified. According to thermodynamics discussion, the modulus of compression and the stress at T-C decrease dramatically. Therefore, the magneto-structural phase transition in MnAs is a kind of soft mode. Copyright (C) EPLA, 2008.
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页数：4
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