Abstract
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) electrons is analyzed on lattices of dimension 1, 2, 3, and 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.
- Received 2 June 1997
DOI:https://doi.org/10.1103/PhysRevLett.80.845
©1998 American Physical Society