Abstract
Thermal fluctuation restores the segregated electronic phase to a homogeneous one at a certain point, the phase-separation (PS) temperature ${T}_{\mathrm{PS}}.$ In this paper, we theoretically investigate the dependence of the PS temperatures on doping and magnetic field in single- and two-orbital double exchange models. We find the polaronic effect favors the PS, and predict an optimized separation temperature. Our results qualitatively interpret the novel electronic behaviors in doped double-exchange manganites.
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