Magnetism and magnetoresistance of Er1-xSmxMn6Ge6(x=0.2－1.0) compounds
Wang Ru-Wu (汪汝武)ab, Zhang Shao-Ying (张绍英)b, Zhang Li-Gang (张立刚)a, Yao Jin-Lei (姚金雷)bc, Li Yun-Bao (李云宝)a, Shen Bao-Gen (沈保根)b
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
Abstract Magnetic and transport properties of Er$_{1-x}$Sm$_x$Mn$_6$Ge$_6$($x$=0.2-1.0) have been investigated by x-ray diffraction (XRD) and magnetization measurement. Analysis of the XRD patterns indicates that the samples with x≤0.4 mainly consist of HfFe$_6$Ge$_6$-type phase and the samples with 0.6≤x≤1.0 mainly consist of YCo$_6$Ge$_6$-type phase (P6/mmm). The lattice constants and the unit cell volume increase with increasing Sm content. The antiferro－ferri－ferromagnetic transitions can be observed with increasing Sm content. The samples with x=0.2 and 0.4 order antiferromagnetically at 420 and 425K, respectively. The samples with x=0.6, 0.8 and 1.0 order from ferri- to ferromagnetically over the whole magnetic ordering temperature range. The corresponding Curie temperatures are 435, 441 and 446K, respectively. The magnetoresistance (MR) isotherms of the sample with x=0.8, measured at various temperatures, are analysed. The magnitude of MR is found to be positive below 55K and gradually increases to a relatively large value of about 5.02% at 5K in a field of 5T as the temperature is lowered. A possible explanation for the positive MR is given.
Received: 13 November 2003
Revised: 12 December 2003
Accepted manuscript online:
PACS:
75.60.Ej
(Magnetization curves, hysteresis, Barkhausen and related effects)
Fund: 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).
Cite this article:
Wang Ru-Wu (汪汝武), Zhang Shao-Ying (张绍英), Zhang Li-Gang (张立刚), Yao Jin-Lei (姚金雷), Li Yun-Bao (李云宝), Shen Bao-Gen (沈保根) Magnetism and magnetoresistance of Er1-xSmxMn6Ge6(x=0.2－1.0) compounds 2004 Chinese Physics 13 1129
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