| Original Articles |
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Simulation of Anisotropic Resistivity for Mixed-Phase Manganite La2/3Ca1/3MnO3 Thin Films |
| ZHOU Qing-Li; GUAN Dong-Yi;JIN Kui-Juan;ZHAO Kun;CHEN Zheng-Hao;LU Hui-Bin;ZHOU Yue-Liang;HAN Peng;YANG Guo-Zhen |
| Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences,
PO Box 603, Beijing 100080 |
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| Cite this article: |
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ZHOU Qing-Li, GUAN Dong-Yi, JIN Kui-Juan et al 2005 Chin. Phys. Lett. 22 1749-1752 |
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Abstract 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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| Keywords:
64.75.+g
75.47.Lx
84.37.+q
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Published: 01 July 2005
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64.75.+g
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75.47.Lx
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(Magnetic oxides)
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84.37.+q
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(Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.))
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