Magnetic properties and magnetocaloric effects of Mn5G3-xGax
Liu Xi-Bin (刘喜斌)ab, Zhang Shao-Ying (张绍英)a, Shen Bao-Gen (沈保根)a
a State Key Laboratory for Magnetism, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; b Chinese People's Armed Police Force Academy , Langfang 065000, China
Abstract We report on the magnetic properties and magnetocaloric effects of Mn$_5$Ge$_{3-x}$Ga$_x$ compounds with $x$=0.1, 0.2, 0.3, 0.4, 0.6 and 0.9. All samples crystallize in the hexagonal Mn$_5$Si$_3$-type structure with space group P6$_3$/mcm and order ferromagnetically. The Curie temperature of these compounds decreases with increasing x, from 306K (x=0.1) to 274K (x=0.9). The average Mn magnetic moments increases with increasing Ga content, reaching a maximum value at x=0.6. The magnetic entropy changes in these compounds are determined from the temperature and field dependence of the magnetization using the thermodynamic Maxwell relation. The Ga substitution has two kinds of influence on the magnetocaloric effect (MCE) of Mn$_5$Ge$_3$. One is that the magnitude of the magnetic entropy change decreases, the other is that the MCE peak becomes broadened.
Received: 17 June 2003
Revised: 04 July 2003
Accepted manuscript online:
(Magnetization curves, hysteresis, Barkhausen and related effects)
Fund: Project supported by the State Key Project of Fundamental Research (Grant No G1998061303) and the National Natural Science Foundation of China (Grant No 10174094).
Cite this article:
Liu Xi-Bin (刘喜斌), Zhang Shao-Ying (张绍英), Shen Bao-Gen (沈保根) Magnetic properties and magnetocaloric effects of Mn5G3-xGax 2004 Chinese Physics 13 397
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