Double-Exchange Model: Phase Diagram at Zero-Temperature

Details Double-Exchange Model: Phase Diagram at Zero-Temperature Double-Exchange Model: Phase Diagram at Zero-Temperature

2005-02-25

arxiv.org/abs/cond-mat/0502621v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

The analytical zero-temperature phase diagram of the double exchange model for classical background spins as a function of the carrier density and Hund's coupling in the entire range of these parameters is presented. By constructing a continuum field theory we explore the possibility of a continuous phase transition from ferromagnetic state to a gently varying textured state. We find such a transition in and below two dimensions and show that the emerging stable state is a spin-spiral which survives the tendency towards phase separation into commonly considered phases, and is also energetically favored to the canted state, for low carrier density.

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