| Spin Dependent Hopping in Ti Doped La0.67 Ca0.33 MnO3 |
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| 引用本文： | 黄宝歆,刘宜华,张汝贞,原晓波,王成建,梅良模. Spin Dependent Hopping in Ti Doped La0.67 Ca0.33 MnO3[J]. 中国稀土学报(英文版), 2004, 22(6): 803-807 |
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| 作者姓名： | 黄宝歆 刘宜华 张汝贞 原晓波 王成建 梅良模 |
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| 作者单位： | [1]DepartmentofPhysics,StateKeyLaboratoryofCrystalMaterials,ShandongUniversity,Jinan250100,China [2]DepartmentofPhysics,StateKeyLaboratoryofCrystalMaterials,ShandongUniversity,Jinan250100,China／／DepartmentofPhysics,WeifangUniversity,Weifang261061,China |
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| 基金项目： | 国家重点基础研究发展计划(973计划) |
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| 摘 要： | A systematic investigation of the magnetic and transport properties of Ti doped La0.67Ca0.33MnO3 was reported. The Ti substitution for Mn ions results in a reduction in ferromagnetism and conductivity. The metal-insulator transition temperature is close to Curie temperature which decreases from 274 to 82 K as x increases from 0 to 0.17. The most important effect of Ti doping is to introduce spin clusters in the samples due to the distortion of local lattice and the inhomogeneous magnetic structure induced primarily by the random distribution of Mn ions. A maximum magnetoresistance ratio as large as 90% in 1 T at 122 K was obtained for the sample with x =0. 055, which is four times larger than that obtained for LCMO sample at 272 K. There is a remarkable field-history dependent MR in the cooling process for the doped samples while such phenomenon disappears in the warming run. The resistivity follows well the variable range hopping behavior in paramagnetic state. Both the size effect and spin dependent hopping of carriers between the spin clusters should be considered in this system.
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| 关 键 词： | 瓷器材料 磁阻效应 稀土元素 钛 镧 |
Spin Dependent Hopping in Ti Doped La0.67Ca0.33MnO3 |
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| Huang Baoxin. Spin Dependent Hopping in Ti Doped La0.67Ca0.33MnO3[J]. Journal of Rare Earths, 2004, 22(6): 803-807 |
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| Authors: | Huang Baoxin |
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| Affiliation: | Huang Baoxin~ |
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| Abstract: | A systematic investigation of the magnetic and transport properties of Ti doped La0.67Ca0.33MnO3 was reported. The Ti substitution for Mn ions results in a reduction in ferromagnetism and conductivity. The metal-insulator transition temperature is close to Curie temperature which decreases from 274 to 82 K as x increases from 0 to 0.17. The most important effect of Ti doping is to introduce spin clusters in the samples due to the distortion of local lattice and the inhomogeneous magnetic structure induced primarily by the random distribution of Mn ions. A maximum magnetoresistance ratio as large as 90% in 1 T at 122 K was obtained for the sample with x=0.055, which is four times larger than that obtained for LCMO sample at 272 K. There is a remarkable field-history dependent MR in the cooling process for the doped samples while such phenomenon disappears in the warming run. The resistivity follows well the variable range hopping behavior in paramagnetic state. Both the size effect and spin dependent hopping of carriers between the spin clusters should be considered in this system. |
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| Keywords: | ceramic materials colossal magnetoresistance spin cluster rare earths |
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