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
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
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.
(Metal-insulator transitions and other electronic transitions)
引用本文:
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. 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[J]. 中国物理快报, 2002, 19(12): 1866-1869.
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. 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. Chin. Phys. Lett., 2002, 19(12): 1866-1869.
2002, Vol. 19 
