Magnetic properties and magnetocaloric effects in GdCo9Si2 compound with multiple magnetic phase transitions

被引:4
作者
Zheng, Z. G. [1 ]
Zhong, X. C. [1 ]
Zhang, J. L. [2 ]
Liu, Z. W. [1 ]
Franco, V. [3 ]
Zeng, D. C. [1 ]
机构
[1] S China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China
[2] City Univ Hong Kong, Dept Phys & Mat Sci, Kowloon Tong, Hong Kong, Peoples R China
[3] Univ Seville, ICMSE CSIC, Dept Condensed Matter Phys, E-41080 Seville, Spain
关键词
D O I
10.1063/1.4799973
中图分类号
O59 [应用物理学];
学科分类号
摘要
The structure and magnetic properties of polycrystalline GdCo9Si2 compound have been investigated. It has a BaCd11 structure and undergoes two magnetic phase transitions: an antiferromagnetic to ferrimagnetic transition occurring at similar to 93 K, and a ferrimagnetic to paramagnetic transition at 420 K, which results in a positive and a negative magnetic entropy change, respectively. The two peak values of magnetic entropy change are -0.6 and 1.1 J.kg(-1).K-1 for Delta H = 5 T. Furthermore, there exists a metal-semiconductor transition temperature (T-P), below which the resistance increases with increasing temperature, while the semiconductor characteristic is observed above T-P. The magnetic domain structures are characterized by stripe and grid structures 1 mu m wide. Although the MCE is small for applications, its study is useful to clearly understand the nature of multiple magnetic phase transitions in the GdCo9Si2 compound. (C) 2013 American Institute of Physics.
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