| Substantial Enhancements of Low—Field Magnetoresistance at Temperatures near 77K with Doping 4% Cu at Mn Sites of La2.3Ca1／3MnO3 Synthesized at 1000℃ |
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| 引用本文： | 袁松柳,张国宏,等.Substantial Enhancements of Low—Field Magnetoresistance at Temperatures near 77K with Doping 4% Cu at Mn Sites of La2.3Ca1／3MnO3 Synthesized at 1000℃[J].中国物理快报,2002,19(12):1866-1869. |
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| 作者姓名： | 袁松柳 张国宏 |
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| 作者单位： | DepartmentofPhysics,HuazhongUniversityofScienceandTechnology,Wuhan430074 |
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| 摘 要： | 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℃.For the x=4% sample,the most remarkable MR effect appears at temperatures near 77K and for magnetic fields lower than 1T.For fields-0.3T and at temperatures-77K,the x=4% sample exhibits a giant MR effect with MR0(≡Δρ/ρ(H=0))between-50and-70%,comparable to the so-called colossal MR response observed in the x=0 sample for the 3T field.
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| 关 键 词： | 多晶体 磁阻 低场增强 |
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