| Simulation of Anisotropic Resistivity for Mixed-Phase Manganite La2／3Ca1／3MnO3 Thin Films |
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| 引用本文： | 周庆莉,关东仪,金奎娟,赵昆,陈正豪,吕惠宾,周岳亮,韩鹏,杨国桢.Simulation of Anisotropic Resistivity for Mixed-Phase Manganite La2／3Ca1／3MnO3 Thin Films[J].中国物理快报,2005,22(7):1749-1752. |
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| 作者姓名： | 周庆莉 关东仪 金奎娟 赵昆 陈正豪 吕惠宾 周岳亮 韩鹏 杨国桢 |
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| 作者单位： | BeijingNationalLaboratoryforCondensedMatterPhysics,InstituteofPhysics,ChineseAcademyofSciences,POBox603,Beijing100080 |
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| 摘 要： | We utilize the random network model based on phase separation scenario to simulate the conductive behaviour and anisotropic characteristics of resistivity for La2/3Ca1/3MnO3 (LCMO) thin films. The simulated results agree well with our experimental data, showing a metal-to-insulator transition from a high-T paramagnetic (PM) insulating phase to a low-T ferromagnetic (FM) metallic phase in both the untilted film deposited on a (001) SrTiO3 (STO) substrate and the tilted film grown on a vicinal cut STO substrate. It is found that the resistivity of the tilted sample is higher than that of the untilted one, displaying prominent anisotropic characteristics. The studies reveal that the tilting not only decreases the conduction of the FM domains, but also increases the activation energy of the PM regions, inducing the enhancement of resistivity. All those results suggest that the intrinsic inhomogeneity in the phase separation system plays a significant role in the electrical conductivity and the resistive anisotropy is related to the structure of the crystal lattice.
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| 关 键 词： | 各向异性 相混合 磁性仿真 锰酸镧钙薄膜 |
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