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
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
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.
(Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.))
引用本文:
CAO Shuo;ZHOU Qing-Li;GUAN Dong-Yi;LU Hui-Bin;YANG Guo-Zhen. Simulation of Temperature-Dependent Resistivity for Manganite La1/3Ca2/3MnO3[J]. 中国物理快报, 2006, 23(6): 1551-1553.
CAO Shuo, ZHOU Qing-Li, GUAN Dong-Yi, LU Hui-Bin, YANG Guo-Zhen. Simulation of Temperature-Dependent Resistivity for Manganite La1/3Ca2/3MnO3. Chin. Phys. Lett., 2006, 23(6): 1551-1553.