The magnetic entropy change in the double perovskite La2NiMnO6 with strong spin-phonon coupling

被引：23
作者：
Luo, X.
Sun, Y. P. [1 ]
Wang, B.
Zhu, X. B.
Song, W. H.
Yang, Z. R.
Dai, J. M.
机构：
[1] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China
来源：
SOLID STATE COMMUNICATIONS | 2009年 / 149卷 / 19-20期
基金：
中国国家自然科学基金;
关键词：
Double perovskite; Critical behavior; ROOM-TEMPERATURE;
D O I：
10.1016/j.ssc.2009.02.020
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The magnetocaloric effect and the critical behavior of La2NiMnO6 are investigated by measurement of the magnetization around T-C. The magnetic entropy change vertical bar Delta S vertical bar of La2NiMnO6 for a field change of 0-45 kOe near the Curie temperature is about 5% of the theoretical expectation. The critical behavior of the La2NiMnO6 deviates from the mean field theory. These abnormal phenomena are understood in the context of the strong spin-phonon coupling in La2NiMnO6. It is suggested that a method of modulating this coupling would enhance the magnetic entropy change greatly, which makes the La2NiMnO6 a promising candidate for room-temperature magnetic refrigeration. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.
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收藏
页码：810 / 813
页数：4
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