Chin. Phys. Lett.  2002, Vol. 19 Issue (12): 1866-1869    DOI:
Original Articles |
Substantial Enhancements of Low-Field Magnetoresistance at Temperatures near 77 K with Doping 4% Cu at Mn Sites of La2/3Ca1/3MnO3 Synthesized at 1000°C
YUAN Song-Liu;ZHANG Guo-Hong;LIU Li;TANG Jie;ZHANG Li-Jiang;ZHONG Qiang-Hua;YANG Ying-Ping;FENG Wen;LIU Sheng;CHEN Wei;XIA Zheng-Cai
Department of Physics, Huazhong University of Science and Technology, Wuhan 430074
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YUAN Song-Liu, ZHANG Guo-Hong, LIU Li et al  2002 Chin. Phys. Lett. 19 1866-1869
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Abstract We report on investigations of magnetoresistance (MR) in polycrystalline La2/3Ca1/3Mn1-xCuxO3 (x = 0 and 4%) samples prepared by the sol-gel method followed a sintering treatment at 1000°C. For the x = 4% sample, the most remarkable MR effect appears at temperatures near 77 K and for magnetic fields lower than 1 T. For fields ~ 0.3 T and at temperatures ~ 77 K, the x = 4% sample exhibits giant MR effect with M0 (≡ Δρ/ρ (H = 0)) between ~ 50 and ~ 70%, comparable to the so-called colossal MR response observed in the x = 0 sample for the 3 T field.
Keywords: 75.30.Vn      72.25.-b      71.30.+h     
Published: 01 December 2002
PACS:  75.30.Vn  
  72.25.-b (Spin polarized transport)  
  71.30.+h (Metal-insulator transitions and other electronic transitions)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2002/V19/I12/01866
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YUAN Song-Liu
ZHANG Guo-Hong
LIU Li
TANG Jie
ZHANG Li-Jiang
ZHONG Qiang-Hua
YANG Ying-Ping
FENG Wen
LIU Sheng
CHEN Wei
XIA Zheng-Cai
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