Percolative model of the effect of disorder on the resistive peak broadening in La2/3Ca1/3MnO3 near the metal-insulator transition

被引：33

作者：

Egilmez, M. ^{[1
]}

Chow, K. H. ^{[1
]}

Jung, J. ^{[1
]}

机构：

[1] Univ Alberta, Dept Phys, Edmonton, AB T6G 2G7, Canada

来源：

APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 16期

基金：

加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1063/1.2908931

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The effect of the lattice disorder on the resistivity of La1-xCaxMnO3 (LCMO) near x=1/3 at the metal-insulator transition was studied by using a percolation model. The percolation model was applied to calculate the temperature dependence of the resistivity rho(T) of the mixed state, where metallic ferromagnetic and insulating paramagnetic clusters simultaneously exist. The temperature dependence of the fraction of the metallic phase was obtained by assuming a Gaussian distribution of random transition temperatures, whose width increases with an increasing lattice disorder. The resistivity rho(T) calculated from the model reproduces well the experimental ones for LCMO crystals and disordered films. (C) 2008 American Institute of Physics.

引用

页数：3

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