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Simulation of Temperature-Dependent Resistivity for Manganite La1/3Ca2/3MnO3 被引量:1

Simulation of Temperature-Dependent Resistivity for Manganite La1/3Ca2/3MnO3
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摘要 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. 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.
出处 《Chinese Physics Letters》 SCIE CAS CSCD 2006年第6期1551-1553,共3页 中国物理快报(英文版)
基金 Supported by the National Natural Science Foundation of China under Grant No 10334070. We would like to thank Professor Jin K. J. for her helpful discussion.
关键词 PHASE-SEPARATION POSITIVE MAGNETORESISTANCE COLOSSAL MAGNETORESISTANCE MAGNETIC-FIELD THIN-FILMS OXIDE LA0.9SR0.1MNO3/SRNB0.01TI0.99O3 HETEROJUNCTIONS HETEROSTRUCTURE LA1-XTEXMNO3 PHASE-SEPARATION POSITIVE MAGNETORESISTANCE COLOSSAL MAGNETORESISTANCE MAGNETIC-FIELD THIN-FILMS OXIDE LA0.9SR0.1MNO3/SRNB0.01TI0.99O3 HETEROJUNCTIONS HETEROSTRUCTURE LA1-XTEXMNO3
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