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Chinese Physics, 2004, Vol. 13(7): 1139-1143    DOI: 10.1088/1009-1963/13/7/031
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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.
Keywords:  magnetotransport properties      magnetocaloric effect      magnetic phase transition  
Received:  14 January 2004      Revised:  10 February 2004      Accepted manuscript online: 
PACS:  75.47.De (Giant magnetoresistance)  
  75.30.Sg (Magnetocaloric effect, magnetic cooling)  
  75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))  
  75.60.Ej (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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