中国物理B ›› 2003, Vol. 12 ›› Issue (5): 562-565.doi: 10.1088/1009-1963/12/5/319

• • 上一篇    

Magnetic properties and magnetoresistance of HfFe2Ge2-type Dy1-xGdxMn6Ge6 (x=0.1－0.6) compounds

张立刚1, 李路1, 汪汝武2, 张绍英3, 沈保根3, 姚金雷4   

  1. (1)Department of Applied Physics, University of Science and Technology of Wuhan, Wuhan 430081, China; (2)Department of Applied Physics, University of Science and Technology of Wuhan, Wuhan 430081, China; State Key Laboratory of Magnetism, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; (3)State Key Laboratory of Magnetism, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; (4)State Key Laboratory of Magnetism, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; State Key Laboratory of silicon Materials, Zhejiang University, Hangzhou 310027, China
  • 收稿日期:2002-12-20 修回日期:2003-01-15 出版日期:2003-05-16 发布日期:2005-03-16
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 50071041), and the State Key Development Programme for Basic Research of China (Grant No G1998061303).

Magnetic properties and magnetoresistance of HfFe2Ge2-type Dy1-xGdxMn6Ge6 (x=0.1－0.6) compounds

Zhang Li-Gang (张立刚)a, Wang Ru-Wu (汪汝武)ab, Li Lu (李路)a, Zhang Shao-Ying (张绍英)b, Yao Jin-Lei (姚金雷)bc, Shen Bao-Gen (沈保根)b    

  1. a Department of Applied Physics, University of Science and Technology of Wuhan, Wuhan 430081, China; b State Key Laboratory of Magnetism, Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; c State Key Laboratory of silicon Materials, Zhejiang University, Hangzhou 310027, China
  • Received:2002-12-20 Revised:2003-01-15 Online:2003-05-16 Published:2005-03-16
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 50071041), and the State Key Development Programme for Basic Research of China (Grant No G1998061303).

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摘要： The magnetic properties and magnetoresistance effects of Dy_{1-x}Gd_xMn_6Ge_6 (x=0.1－0.6) compounds have been studied by magnetic properties and resistivity measurements in applied magnetic fields up to 5T. The compounds with x=0.1, 0.2, 0.4 and 0.5 order antiferromagnetically at 425, 428, 430 and 432K, respectively, and there are second magnetic phase transitions below 100K. The compound with x=0.6 exhibits a transition from ferrimagnetic to antiferromagnetic, then to ferrimagnetic state again with decreasing temperature. Furthermore, it displays a field-induced metamagnetic transition, and its threshold field decreases with increasing temperature. The magnetoresistance curve of the compound with x=0.6 in applied magnetic fields up to 5T is presented and the magnetoresistance effects are related to the metamagnetic transitions.

Abstract: The magnetic properties and magnetoresistance effects of Dy$_{1-x}$Gd$_x$Mn$_6$Ge$_6$ (x=0.1－0.6) compounds have been studied by magnetic properties and resistivity measurements in applied magnetic fields up to 5T. The compounds with x=0.1, 0.2, 0.4 and 0.5 order antiferromagnetically at 425, 428, 430 and 432K, respectively, and there are second magnetic phase transitions below 100K. The compound with x=0.6 exhibits a transition from ferrimagnetic to antiferromagnetic, then to ferrimagnetic state again with decreasing temperature. Furthermore, it displays a field-induced metamagnetic transition, and its threshold field decreases with increasing temperature. The magnetoresistance curve of the compound with x=0.6 in applied magnetic fields up to 5T is presented and the magnetoresistance effects are related to the metamagnetic transitions.

Key words: magnetic property, magnetoresistance effect

中图分类号:  (Magnetotransport phenomena; materials for magnetotransport)

  • 75.47.-m
75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 75.40.-s (Critical-point effects, specific heats, short-range order)