Doping change and distortion effect on double-exchange ferromagnetism

Details Doping change and distortion effect on double-exchange ferromagnetism Doping change and distortion effect on double-exchange ferromagnetism

2005-12-13

arxiv.org/abs/cond-mat/0512265v1

Phys. Rev. B 72, 214418 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 8 figures

Scientific paper

10.1103/PhysRevB.72.214418

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.

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