TY - JOUR

T1 - Ferromagnetic transition in a double-exchange system containing impurities

AU - Auslender, Mark

AU - Kogan, Eugene

PY - 2002

Y1 - 2002

N2 - We study the ferromagnetic transition in a three-dimensional double-exchange model containing impurities. The influence of both spin fluctuations and the impurity potential on conduction electrons is described in a coherent potential approximation. In the framework of the thermodynamic approach we construct a Landau functional for the system “electrons (in disordered environment) + core spins.” Analyzing the Landau functional we calculate the temperature of the ferromagnetic transition (formula presented) and paramagnetic susceptibility χ. For (formula presented) 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 alloy disorder, able to produce a gap in the density of electron states, can substantially decrease (formula presented) with respect to the case of no impurities.

AB - We study the ferromagnetic transition in a three-dimensional double-exchange model containing impurities. The influence of both spin fluctuations and the impurity potential on conduction electrons is described in a coherent potential approximation. In the framework of the thermodynamic approach we construct a Landau functional for the system “electrons (in disordered environment) + core spins.” Analyzing the Landau functional we calculate the temperature of the ferromagnetic transition (formula presented) and paramagnetic susceptibility χ. For (formula presented) 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 alloy disorder, able to produce a gap in the density of electron states, can substantially decrease (formula presented) with respect to the case of no impurities.

UR - http://www.scopus.com/inward/record.url?scp=85038283974&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.65.012408

DO - 10.1103/PhysRevB.65.012408

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AN - SCOPUS:0036147528

SN - 1098-0121

VL - 65

SP - 1

EP - 4

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 1

ER -