Field-induced entropy change in the manganite with significant short-range magnetic order

被引：29

作者：

Jia, L. ^{[1
]}

Liu, G. J. ^{[1
]}

Wang, J. Z. ^{[1
]}

Sun, J. R. ^{[1
]}

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

Shen, B. G. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 12期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1063/1.2355441

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Effects of short-range magnetic order on magnetic entropy change have been studied for the manganese oxide Eu0.55Sr0.45MnO3. Superparamagnetic clusters composed of seven to ten Mn ions, depending on applied field, have been derived in the paramagnetic state of the compound based on the analysis of dc susceptibility. The presence of short-range magnetic order greatly depresses the magnetic entropy of the paramagnetic phase; thus the entropy changes at the field-induced paramagnetic to ferromagnetic phase transition. The maximum entropy change detected is only similar to 7 J/kg K for a field change of 0-5 T, about one-fifth of the theoretical expectation. The experimental results can be well elucidated within the mean field theory. It is suggested that a way of destroying the short-range order would enhance the magnetic entropy change greatly. (c) 2006 American Institute of Physics.

引用

页数：3

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