| Electrical Transport and Giant Magnetoresistance in （ 1 - x ） La0.67 Ca0.33 MnO3/x CuO Composites |
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| 引用本文： | 缪菊红,袁松柳,任光明,肖循,余功奇.Electrical Transport and Giant Magnetoresistance in （ 1 - x ） La0.67 Ca0.33 MnO3/x CuO Composites[J].中国稀土学报(英文版),2007,25(2):204-209. |
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| 作者姓名： | 缪菊红 袁松柳 任光明 肖循 余功奇 |
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| 作者单位： | [1]School of Mathematics ＆ Physics, Nanjing University of Information Science ＆ Technology, Nanjing 210044, China; [2]Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China （10374032） |
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| 摘 要： | Samples with nominal composition of （1 - x）La0.67Ca0.33MnO3 （LCMO）/xCuO （x = 0%, 2%, 4% and 20% ） were made using a special experimental method. The temperature dependence of the resistivity （ρ） of the composites was investigated in the temperature range of 10 - 300 K and different magnetic fields of H = 0, 0.1, 0.3, 0.5, 1.0 and 3.0 T. The results showed that CuO percentage x had important effects on metal-insulator transition temperature （Tp）, zero field peak resistivity （ρmax）, and magnetoresistance （MR） properties of the composites. Tp shifted sharply towards low temperature with the increase of x in the range of x ≤4%, but was almost independent of x at high level of CuO content. Composites with x = 4 % and 20 % exhibited similar electrical transmission behavior. Compared with pure LCMO, enhanced magnetoresistance could be clearly observed even in a quite low magnetic field of 0.3 T. For x =4% and 20% samples, the MR value at 0.3 T could reach as high as - 88% and - 90%, respectively. XRD and SEM analysis showed that the substantial enhancement of MR, especially near Tp, was because of local spin disorder between contiguous LCMO ferromagnetic particles caused by the addition of CuO.
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| 关 键 词： | 稀土 电子传输 巨磁阻效应 钙钛矿型 亚锰酸盐 |
| 文章编号： | 1002-0721（2007）02-0204-06 |
| 收稿时间： | 2006-06-10 |
| 修稿时间： | 2006-12-20 |
Electrical Transport and Giant Magnetoresistance in (1 - x) La0.67 Ca0.33 MnO3/x CuO Composites |
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| Juhong , Songliu Yuan, Guangming Ren, Xun Xiao,Gongqi Yu.Electrical Transport and Giant Magnetoresistance in (1 - x) La0.67 Ca0.33 MnO3/x CuO Composites[J].Journal of Rare Earths,2007,25(2):204-209. |
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| Authors: | Juhong Songliu Yuan Guangming Ren Xun Xiao Gongqi Yu |
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| Affiliation: | aSchool of Mathematics & Physics, Nanjing University of Information Science & Technology, Nanjing 210044, China;bDepartment of Physics, Huazhong University of Science and Technology, Wuhan 430074, China |
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| Abstract: | Samples with nominal composition of (1 - x) La0.67Ca0.33MnO3 (LCMO)/xCuO (x = 0%, 2%, 4% and 20%) were made using a special experimental method. The temperature dependence of the resistivity (ρ) of the composites was investigated in the temperature range of 10  300 K and different magnetic fields of H = 0, 0.1, 0.3, 0.5. 1.0 and 3.0 T. The results showed that CuO percentage x had important effects on metal-insulator transition temperature (Tp), zero field peak resistivity (ρmax), and magnetoresistance (MR) properties of the composites. TP shifted sharply towards low temperature with the increase of x in the range of x ≤ 4%, but was almost independent of x at high level of CuO content. Composites with x = 4% and 20% exhibited similar electrical transmission behavior. Compared with pure LCMO, enhanced magnetoresistance could be clearly observed even in a quite low magnetic field of 0.3 T. For x = 4% and 20% samples, the MR value at 0.3 T could reach as high as 88% and 90%, respectively. XRD and SEM analysis showed that the substantial enhancement of MR, especially near Tp, was because of local spin disorder between contiguous LCMO ferromagnetic particles caused by the addition of CuO. |
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| Keywords: | perovskite manganite low-field magnetoresistance spin-polarized tunneling spin disorder rare earths |
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