Phase Separation in Electronic Models for Manganites

Details Phase Separation in Electronic Models for Manganites Phase Separation in Electronic Models for Manganites

1997-06-02

arxiv.org/abs/cond-mat/9706014v2

Physics

Condensed Matter

Strongly Correlated Electrons

Accepted in Phys. Rev. Letters

Scientific paper

10.1103/PhysRevLett.80.845

The Kondo lattice Hamiltonian with ferromagnetic Hund's coupling as a model for manganites is investigated. The classical limit for the spin of the (localized) $t_{2g}$ electrons is analyzed on lattices of dimension 1,2,3 and $\infty$ using several numerical methods. The phase diagram at low temperature is presented. A regime is identified where phase separation occurs between hole undoped antiferromagnetic and hole-rich ferromagnetic regions. Experimental consequences of this novel regime are discussed. Regions of incommensurate spin correlations have also been found. Estimations of the critical temperature in 3D are compatible with experiments.

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