Magnetic entropy change in La(Fe0.98C0.02)11.7A1l1.3

被引:100
作者
Hu, FX
Shen, BG
Sun, JR
Cheng, ZH
Zhang, XX
机构
[1] Chinese Acad Sci, Inst Phys, State Key Lab Magnetism, Beijing 100080, Peoples R China
[2] Chinese Acad Sci, Ctr Condensed Matter Phys, Beijing 100080, Peoples R China
[3] Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China
关键词
D O I
10.1088/0953-8984/12/46/101
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Magnetization of compound La(Fe0.98Co0.02)(11.7)Al-1.3 was measured carefully as functions of temperature and applied field around its Curie temperature of similar to 198 K. Magnetic entropy change \DeltaS\, allowing estimation of the magnetocaloric effect (MCE), was determined based on thermodynamic Maxwell's relation. The achieved magnitude of \Delta Si\ reaches 10.6 J kg(-1) K-1 under a field of 5 T. The considerable entropy change is believed to be due to the high magnetization and the sharp change in magnetization at T-C. It is found that the magnetic phase transition is completely reversible in temperature, indicating a nature of second-order phase transition.
引用
收藏
页码:L691 / L696
页数:6
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