Ferromagnetic transition in a double-exchange system with alloy disorder

Mark Auslender, Eugene Kogan

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5 Scopus citations

Abstract

We study ferromagnetic transition in three-dimensional double-exchange model containing impurities. The influence of both spin fluctuations and impurity potential on conduction electrons is described in coherent potential approximation. In the framework of thermodynamic approach we construct Landau functional for the system "electrons (in disordered environment) + core spins". Analyzing the Landau functional we calculate the temperature of ferromagnetic transition TC and paramagnetic susceptibility χ. For TC, we thus extend the result obtained by Furukawa in the framework of the dynamical mean field approximation, with which our result coincides in the limit of zero impurity potential. We find, that the alloy disorder, able to produce a gap in density of electron states, can substantially decrease TC with respect to the case of no impurities. We also study the general relation between the coherent potential approximation and the dynamical mean field approximation.

Original languageEnglish
Pages (from-to)345-358
Number of pages14
JournalPhysica A: Statistical Mechanics and its Applications
Volume302
Issue number1-4
DOIs
StatePublished - 15 Dec 2001
EventInternational Workshop on Frontiers in the Physics of Complex Systems - Ramat-Gan, Israel
Duration: 25 Mar 200128 Mar 2001

Bibliographical note

Funding Information:
This research was supported by the Israeli Science Foundation administered by the Israel Academy of Sciences and Humanities.

Funding

This research was supported by the Israeli Science Foundation administered by the Israel Academy of Sciences and Humanities.

FundersFunder number
Israel Academy of Sciences and Humanities
Israel Science Foundation

    Keywords

    • Alloy disorder
    • Coherent potential approximation
    • Dynamical mean field theory
    • Ferromagnetic transition
    • Manganites
    • Strongly correlated system

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