中国物理B ›› 2004, Vol. 13 ›› Issue (7): 1139-1143.doi: 10.1088/1009-1963/13/7/031

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Magnetotransport properties and magnetocaloric effects of Mn1.95Cr0.05Sb0.95Ga0.05 compound

张绍英1, 沈保根1, 姚金雷1, 王芳1, 刘喜斌2   

  1. (1)State Key Laboratory for Magnetism, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; (2)State Key Laboratory for Magnetism, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; Chinese People's Armed Police Force Academy, Langfang 065000, China
  • 收稿日期:2004-01-14 修回日期:2004-02-10 出版日期:2004-07-05 发布日期:2005-07-05
  • 基金资助:
    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).

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   

  1. 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
  • Received:2004-01-14 Revised:2004-02-10 Online:2004-07-05 Published:2005-07-05
  • Supported by:
    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).

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摘要： 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_s=200K. 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 ΔS_M^{max}(T,ΔH) are 4.4, 4.1, 3.6, 2.8 and 1.5 J/(kg·K) for magnetic field changes of 0－5T, 0－4T, 0－3T, 0－2T and 0－1T, respectively.

关键词: magnetotransport properties, magnetocaloric effect, magnetic phase transition

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.

Key words: magnetotransport properties, magnetocaloric effect, magnetic phase transition

中图分类号:  (Giant magnetoresistance)

  • 75.47.De
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)