T=0 Phase Diagram of the Double-Exchange Model
Strongly Correlated Electrons
2009-10-31 v2
Abstract
We present the T=0 phase diagram of the double-exchange model (ferromagnetic Kondo lattice model) for all values of the carrier concentration and Hund's couplng , within dynamical mean field theory. We find that depending on the values of and , the ground state is either a ferromagnet, a commensurate antiferromagnet or some other incommensurate phase with intermediate wave vectors . The antiferromagnetic phase is separated by first order phase boundaries and wide regimes of phase separation. The transition from the ferromagnetic phase to an incommensurate phase is second order.
Cite
@article{arxiv.cond-mat/0004151,
title = {T=0 Phase Diagram of the Double-Exchange Model},
author = {A. Chattopadhyay and A. J. Millis and S. Das Sarma},
journal= {arXiv preprint arXiv:cond-mat/0004151},
year = {2009}
}
Comments
4 pages, 5 figures. The analysis now includes incommensurate phases with arbitrary wave vectors. Correspondingly, the figures have been changed