Microscopic simulation of the percolation of manganites

Dong, Shuai; Zhu, Han; Wu, X.; Liu, J.-M.
January 2005
Applied Physics Letters;1/10/2005, Vol. 86 Issue 2, p022501
Academic Journal
The one-orbital double exchange model is studied using the METROPOLIS Monte Carlo method and the microscopic resistor network. The phase competition and percolation are displayed microscopically. As far as the resistivity is concerned, the metal–insulator transition is described by the competition between a fraction p of metallic resistors and a fraction 1-p of insulating resistors. p can be obtained as a function of temperature T, doping percentage x, and external field H. In the present model, systems with different x, T, and H can be unified into a single class of percolation, which is different from the standard picture.


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