Giant Low-Field Magnetoresistance in Polycrystalline La2/3Ca1/3Mn1-xCuxO3 Sintered at 1100 ℃
来源期刊：JOURNAL OF RARE EARTHS2004年第3期
论文作者：夏正才 刘洁 袁松柳 张国庆 杨应平
Key words：condensed matter physics; magnetoresistance; Sol-Gel; Cu doping; rare earths;
Abstract: The La2/3Ca1/3Mn1-xCuxO3 (0≤x＜6%) samples were prepared by sol-gel method. Transport properties, conductive mechanism and low-field magnetoresistance (MR0) were investigated. It is found that conductive mechanism is described by Mott′s variable-range hopping and the MR0 near the insulator-metal transition temperature (Tp) increases from 2% to 80% with x from 0 to 4% for a low field of 0.3 T. The experiment also shows that the intergrain magnetoresistance is largely improved. The results indicate that a proper amount of Cu doping can substantially improve magnetoresistance effects.
夏正才1，刘洁1，袁松柳1，张国庆1，杨应平1
(1.Department of Physics,Huazhong University of Science and Technology, Wuhan 430074, China;
2.Department of Physics, Wuhan University of Technology, Wuhan 430070, China)
Abstract:The La2/3Ca1/3Mn1-xCuxO3 (0≤x＜6%) samples were prepared by sol-gel method. Transport properties, conductive mechanism and low-field magnetoresistance (MR0) were investigated. It is found that conductive mechanism is described by Mott′s variable-range hopping and the MR0 near the insulator-metal transition temperature (Tp) increases from 2% to 80% with x from 0 to 4% for a low field of 0.3 T. The experiment also shows that the intergrain magnetoresistance is largely improved. The results indicate that a proper amount of Cu doping can substantially improve magnetoresistance effects.
Key words:condensed matter physics; magnetoresistance; Sol-Gel; Cu doping; rare earths;
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