Double-Exchange Model: Phase Diagram at Zero-Temperature
Strongly Correlated Electrons
2007-05-23 v1
Abstract
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.
Cite
@article{arxiv.cond-mat/0502621,
title = {Double-Exchange Model: Phase Diagram at Zero-Temperature},
author = {David Pekker and Swagatam Mukhopadhyay and Nandini Trivedi and Paul M. Goldbart},
journal= {arXiv preprint arXiv:cond-mat/0502621},
year = {2007}
}