| Original Articles |
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Effect of High Resistance Phases on Metal-Insulator Transition of La0.67Ca0.33MnO3 |
| XIA Zheng-Cai;YUAN Song-Liu;ZHANG Li-Jiang;ZHANG Guo-Hong;FENG Wen;TANG Jie;LIU Li;LIU Sheng;TANG Chao-Qun |
| Department of Physics, Huazhong University of Science and Technology, Wuhan 430074 |
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| Cite this article: |
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XIA Zheng-Cai, YUAN Song-Liu, ZHANG Li-Jiang et al 2003 Chin. Phys. Lett. 20 1116-1119 |
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Abstract The temperature dependence of resistivity ρ of YSZ doping composite of (1-x)La0.67Ca0.33MnO3 + xYSZ and Y2O3 doping composite of (1-y)La0.67Ca0.33MnO3 + yY2O3 is investigated, respectively, in a temperature range 77-300 K, where the YSZ represents yttria-stabilized zirconia (8 mol%Y2O3 + 92 mol% ZrO2). Experimental results show that the YSZ doping level has important effects on both the metal-insulator (M-I) transition temperatures and zero field resistivity of the composites of (1-x)La0.67Ca0.33MnO3 + xYSZ. However, the Y2O3 doping level has little effect on the M-I transition temperatures and the zero field resistivity of (1-y)La0.67Ca0.33MnO3 + yY2O3 only increases slightly. The difference between the two types of composites may mainly result from the different distribution of high resistance phases at the grain boundaries and/or surfaces of La0.67Ca0.33MnO3 grains rather than the substitution of La3+ ions with Y3+ ions.
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| Keywords:
71.30.+h
75.30.Kz
75.30.Vn
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Published: 01 July 2003
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| PACS: |
71.30.+h
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(Metal-insulator transitions and other electronic transitions)
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75.30.Kz
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(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
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75.30.Vn
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