Chin. Phys. Lett.  2003, Vol. 20 Issue (7): 1116-1119    DOI:
Original Articles |
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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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.
Keywords: 71.30.+h      75.30.Kz      75.30.Vn     
Published: 01 July 2003
PACS:  71.30.+h (Metal-insulator transitions and other electronic transitions)  
  75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))  
  75.30.Vn  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2003/V20/I7/01116
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XIA Zheng-Cai
YUAN Song-Liu
ZHANG Li-Jiang
ZHANG Guo-Hong
FENG Wen
TANG Jie
LIU Li
LIU Sheng
TANG Chao-Qun
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