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T = 0 phase diagram of the double-exchange model

2001; American Physical Society; Volume: 64; Issue: 1 Linguagem: Inglês

10.1103/physrevb.64.012416

1095-3795

Aparajeo Chattopadhyay, Andrew J. Millis, S. Das Sarma,

Physics of Superconductivity and Magnetism

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.