| Structure and Transport Properties in CMR Materials of La（1-x）2/3Ca1/3MnO3 with Rare Earth Vacancies |
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| 引用本文： | Li Xiaoyi Luo Guangsheng Wu Xiaoshan. Structure and Transport Properties in CMR Materials of La（1-x）2/3Ca1/3MnO3 with Rare Earth Vacancies[J]. 中国稀土学报(英文版), 2006, 24(2): 242-242 |
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| 作者姓名： | Li Xiaoyi Luo Guangsheng Wu Xiaoshan |
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| 作者单位： | [1]School of Material Science and Engineering, Nanchang University, Nanchang 330047, China [2]Lab of Solid Microstructures, Nanjing University, Nanjing 210093, China |
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| 摘 要： | Samples of manganese oxides La（1-x）2/3Ca1/3MnO3（x 〈 0.10） with Lavacancy were prepared by standard solid-state reaction method. All the samples are single phase, with orthorhombic symmetry （Pnma ）, analyzed by XRD and with Rietveld Refinement. The effect of different La-site vacancies concentration on electronic transport of La（1-x）2/3Ca1/3MnO3 was investigated. The insulator-metal transition temperature （about 267 K） nearly remains unchanged with the increase of vacancy concentration, which indicates that small La-vacancy does not destroy the double exchange interaction. But the electronic resistance increases and MR value decreases with La-vacancy content x 〉 0.04. The maximum of the MR value （8 T） is about 220% at transition temperature （TMI）.
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| 关 键 词： | CMR 结构 输运性能 稀土 磁阻 |
Structure and Transport Properties in CMR Materials of La_((1-x)2/3)Ca_(1/3)MnO_3 with Rare Earth Vacancies |
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| Li;Xiaoyi;Luo;Guangsheng;Wu;Xiaoshan. Structure and Transport Properties in CMR Materials of La_((1-x)2/3)Ca_(1/3)MnO_3 with Rare Earth Vacancies[J]. Journal of Rare Earths, 2006, 24(2): 242-242 |
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| Authors: | Li Xiaoyi Luo Guangsheng Wu Xiaoshan |
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| Abstract: | Samples of manganese oxides La_((1-x)2/3)Ca_(1/3)MnO_3 (x<0.10) with La-vacancy were prepared by standard solid-state reaction method. All the samples are single phase, with orthorhombic symmetry(Pnma), analyzed by XRD and with Rietveld Refinement. The effect of different La-site vacancies concentration on electronic transport of La_ 2/3 Ca_ 1/3 MnO_3 was investigated. The insulator-metal transition temperature(about 267 K) nearly remains unchanged with the increase of vacancy concentration, which indicates that small La-vacancy does not destroy the double exchange interaction. But the electronic resistance increases and MR value decreases with La-vacancy content x>0.04. The maximum of the MR value (8 T) is about 220% at transition temperature(T_(MI)). |
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| Keywords: | La_((1-x)2/3)Ca_(1/3)MnO_3 La-vacancy structure magnetoresistance rare earths |
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