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Simulation of Temperature-Dependent Resistivity for Manganite La1/3Ca2/3MnO3 |
| CAO Shuo1,2;ZHOU Qing-Li1;GUAN Dong-Yi1;LU Hui-Bin1;YANG Guo-Zhen1 |
| 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080
2Department of Physics, University of Liaoning, Shenyang 110036 |
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| Cite this article: |
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CAO Shuo, ZHOU Qing-Li, GUAN Dong-Yi et al 2006 Chin. Phys. Lett. 23 1551-1553 |
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Abstract The resistivity of the heavy-doped La1/3Ca2/3MnO3 (LCMO) is simulated using a random resistor network model, based on a phase separation scenario. The simulated results agree well with the reported experimental data, showing a transition from a charge-disordered (CDO) state embedded with a few ferromagnetic (FM) metallic clusters to a charge-ordered (CO) state, corresponding to the transition from a high-temperature paramagnetic (PM) insulating state to a low-temperature antiferromagnetic (AF) insulating state. Furthermore, we find that the number of AF/CO clusters increases with decreasing temperature, and the clusters start to connect to each other around 250K, which causes percolating in the system. The results further verify that phase separation plays a crucial role in the electrical conductivity of LCMO.
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| Keywords:
64.75.+g
75.47.Lx
84.37.+q
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Published: 01 June 2006
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| PACS: |
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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