Magnetotransport properties and magnetocaloric effects of Mn1.95Cr0.05Sb0.95Ga0.05 compound
Liu Xi-Bin (刘喜斌)ab, Zhang Shao-Ying (张绍英)a, Shen Bao-Gen (沈保根)a, Yao Jin-Lei (姚金雷)a, Wang Fang (王芳)a
a State Key Laboratory for Magnetism, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; b Chinese People's Armed Police Force Academy, Langfang 065000, China
Abstract The magnetotransport properties and magnetocaloric effects of the compound Mn$_{1.95}$Cr$_{0.05}$Sb$_{0.95}$Ga$_{0.05}$ have been studied. With decreasing temperature, a spontaneous first-order magnetic phase transition from ferrimagnetic (FI) to antiferromagnetic (AF) state takes place at $T_{\rm s}=200$K. A metamagnetic transition from the AF to FI state can be induced by an external field, accompanied by a giant magnetoresistance effect of 57%. The magnetic entropy changes are determined from the temperature and field dependence of the magnetization using the thermodynamic Maxwell relation. Mn$_{1.95}$Cr$_{0.05}$Sb$_{0.95}$Ga$_{0.05}$ exhibits a negative magnetocaloric effect, and the absolute values of $\Delta S_{\rm M}^{\rm max}(T, \Delta H)$ are 4.4, 4.1, 3.6, 2.8 and 1.5 J/(kg$\cdot$K) for magnetic field changes of 0－5T, 0－4T, 0－3T, 0－2T and 0－1T, respectively.
Received: 14 January 2004
Revised: 10 February 2004
Accepted manuscript online:
(Magnetization curves, hysteresis, Barkhausen and related effects)
Fund: Project supported by the State Key Development Programme for Basic Research of China (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), Yao Jin-Lei (姚金雷), Wang Fang (王芳) Magnetotransport properties and magnetocaloric effects of Mn1.95Cr0.05Sb0.95Ga0.05 compound 2004 Chinese Physics 13 1139
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