T=0 Phase Diagram of the Double-Exchange Model

Abstract

We present the T=0 phase diagram of the double-exchange model (ferromagnetic Kondo lattice model) for all values of the carrier concentration $n$ and Hund's couplng $J$, within dynamical mean field theory. We find that depending on the values of $n$ and $J$, 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.

4 pages, 5 figures. The analysis now includes incommensurate phases with arbitrary wave vectors. Correspondingly, the figures have been changed

References in corpus (3)

• Theory of Diluted Magnetic Semiconductor Ferromagnetism
• Resistivity of Mixed-Phase Manganites
• Discontinuous transitions in double exchange materials

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