中国物理B ›› 2004, Vol. 13 ›› Issue (7): 1139-1143.doi: 10.1088/1009-1963/13/7/031
张绍英1, 沈保根1, 姚金雷1, 王芳1, 刘喜斌2
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
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.
中图分类号: (Giant magnetoresistance)