Percolation model of the temperature dependence of resistance in doped manganese perovskites

Yuan, S. L.; Li, Z. Y.; Peng, G.; Xiong, C. S.; Xiong, Y. H.; Tang, C. Q.
July 2001
Applied Physics Letters;7/2/2001, Vol. 79 Issue 1, p90
Academic Journal
Assuming the sample to consist of ferromagnetic metallic (FMM) particles with a volume fraction (f ) randomly distributed over the paramagnetic insulating background, Monte Carlo simulations of electrical conductivity show excellent fits to the data measured in (La[sub 1-x]Y[sub x])[sub 2/3]Ca[sub 1/3]MnO[sub 3] (x=0, 0.1 and 0.2). We find that the transition to metallic state occurs as the f reaches a percolation threshold, suggesting that the percolation of FMM domains is responsible for the observed insulator-metal transition. © 2001 American Institute of Physics.


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