| Lattice Effects and Irreversible Magnetoresistance in Gd Doped La—Ca—Mn—O |
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| 引用本文： | BaoxinHUANG YihuaLIU 等.Lattice Effects and Irreversible Magnetoresistance in Gd Doped La—Ca—Mn—O[J].材料科学技术学报,2002,18(6):509-512. |
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| 作者姓名： | BaoxinHUANG YihuaLIU |
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| 作者单位： | DepartmentofPhysicsandStatekeyLaboratoryofCrystalMaterials,ShandongUniversity,Jinan250100,China |
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| 基金项目： | This work was supported by the State Key Project of Funda-mental Research (G19980613010)，the National Scientific and Technological Department of China. |
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| 摘 要： | The Gd substituting effects for La in La0.67Ca0.33MnO3 has been studied .With increasing the substituting amount of Gd,the phase transition temperature of metal-isolator for the samples decreases,the corresponding peak resistivity increases,the Curie temperature decreases monotonically.The substitution of La-Ca-Mn-O with 11% Gd for La improved the magnetoresistance ratio by an order of magnitude.The effects of substituting Gd can be explained in terms of the lattice effects.An irreversible MR behaviour was observed in Gd-substituting compounds.This effect became marked when the substituting amount of Gd was greater than 7%.A maximum irreversible increment of MR ratio as large as 91% was obtained when Gd substituting amount was 11%.
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| 关 键 词： | 镧 钙 锰 钆 复合氧化物 磁阻效应 掺杂 La0.67Ca0.33MnO3 |
| 收稿时间： | 2002-03-18 |
Lattice Effects and Irreversible Magnetoresistance in Gd Doped La-Ca-Mn-O |
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| Baoxin HUANG,Yihua LIU,Ruzhen ZHANG,Chengjian WANG,Gang JI,Liangmo MEI.Lattice Effects and Irreversible Magnetoresistance in Gd Doped La-Ca-Mn-O[J].Journal of Materials Science & Technology,2002,18(6):509-512. |
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| Authors: | Baoxin HUANG Yihua LIU Ruzhen ZHANG Chengjian WANG Gang JI Liangmo MEI |
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| Affiliation: | Department of Physics and State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, China |
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| Abstract: | The Gd substituting effects for La in La0.67Ca0.33MnO3 has been studied. With increasing the substituting amount of Gd, the phase transition temperature of metal-isolator for the samples decreases, the corresponding peak resistivity increases, the Curie temperature decreases monotonically. The substitution of La-Ca-Mn-O with 11% Gd for La improved the magnetoresistance ratio by an order of magnitude. The effects of substituting Gd can be explained in terms of the lattice effects. An irreversible MR behaviour was observed in Gd-substituting compounds. This effect became marked when the substituting amount of Gd was greater than 7%. A maximum irreversible increment of MR ratio as large as 91% was obtained when Gd substituting amount was 11%. |
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| Keywords: | Manganese perovskites Colossal magnetoresistance Lattice effect Irreversible magnetoresistance |
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