a Department of Physics, University of Science and Technology of China, Hefei 230026, China; b State Key Laboratory of Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; c Department of Physics, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, China
Abstract The magnetic and transport properties of the Ga-doped charge-ordering state La0.5Ca0.5MnO3 have been studied. A current-dependent large positive magnetoresistance (1080%) at 5 K was observed. These observations are interpreted in terms of the spin-dependent tunnelling process between ferromagnetic clusters embedded in an antiferromagnetic matrix.
Received: 01 March 2001
Revised: 15 May 2001
Accepted manuscript online:
(Magnetic properties of interfaces (multilayers, superlattices, heterostructures))
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 19934003) and the State Key program of Research (Grant No. G1998061310).
Cite this article:
Chen Xin (陈新), Wang Zhi-hong (王志宏), Li Run-wei (李润伟), Shen Bao-gen (沈保根), Zhao Hong-wu (赵宏武), Zhan Wen-shan (詹文山), Chen Jin-song (陈金松), Zhang Xi-xiang (张西祥) CURRENT-DEPENDENT POSITIVE MAGNETORESISTANCE IN Ga-DOPED La0.5Ca0.5MnO3 2001 Chinese Physics 10 751
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