Doping change and distortion effect on double-exchange ferromagnetism

Article

关键词: FALICOV-KIMBALL MODEL;    MEAN-FIELD THEORY;    MN K EDGE;    PHASE-SEPARATION;    LARGE DIMENSIONS;    TRANSPORT-PROPERTIES;    MANGANITES;    SEGREGATION;    TRANSITIONS;    THERMODYNAMICS;   

DOI  :  10.1103/PhysRevB.72.214418

来源: SCIE

【 摘 要 】

Doping change and distortion effect on the double-exchange ferromagnetism are studied within a simplified double-exchange model. The presence of distortion is modelled by introducing the Falicov-Kimball interaction between itinerant electrons and classical variables. By employing the dynamical mean-field theory the charge and spin susceptibility are exactly calculated. It is found that there is a competition between the double-exchange induced ferromagnetism and disorder-order transition. At low temperature various long-range order phases such as charge ordered and segregated phases coexist with ferromagnetism depending on doping and distortion. A rich phase diagram is obtained.

【 授权许可】

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