The entropy change of the field-induced antiferromagnetic-ferromagnetic transition in Pr0.5Sr0.5MnO3

被引：12
作者：
Liu, G. J. [1 ]
Sun, J. R. [2 ,3 ]
Shen, B. G. [2 ,3 ]
机构：
[1] Ocean Univ China, Coll Informat Sci & Engn, Qingdao 266003, Shandong, Peoples R China
[2] Chinese Acad Sci, State Key Lab Magnetism, Inst Phys, Beijing 100080, Peoples R China
[3] Chinese Acad Sci, Ctr Condensed Matter Phys, Beijing 100080, Peoples R China
来源：
SOLID STATE COMMUNICATIONS | 2009年 / 149卷 / 17-18期
关键词：
Magnetic entropy change; Antiferromagnetic-ferromagnetic transitions; ADIABATIC TEMPERATURE-CHANGE; ROOM-TEMPERATURE; GD5SI2GE2;
D O I：
10.1016/j.ssc.2009.02.006
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
In this work, the entropy change in Pr0.5Sr0.5MnO3 around the field-induced antiferromagnetic-ferromangetic transition is reported. The entropy, calculated based on the magnetic data through Maxwell relation, has reached values of similar to 4.8 J/kg K for a field change of 8 T, which is numerically as large as that reported for some giant magnetocaloric materials, but with opposite sign. Despite the coexistence of the antiferromagnetic and ferromagnetic phases and variational phase fractions, Maxwell relation gives the proper description of the entropy change. After a careful analysis, the success of Maxwell relation here can be attributed to the fact that the heat capacity of ferromagnetic phase is higher than that of the antiferromagnetic phase. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码：722 / 724
页数：3
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