Discontinuous transitions in double exchange materials

Abstract

It is shown that the double exchange Hamiltonian, with weak antiferromagnetic interactions, has a rich variety of first order transitions between phases with different electronic densities and/or magnetizations. For band fillings in the range $0.3\le x\le 0.5$, and at finite temperatures, a discontinuous transition between phases with similar electronic densities but different magnetizations takes place. This sharp transition, which is not suppressed by electrostatic effects, and survives in the presence of an applied field, is consistent with the phenomenology of the doped manganites near the transition temperature.

three more variational ansatzs considered

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• Island phases and charge order in two-dimensional manganites
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• Monte Carlo determination of the phase diagram of the double-exchange model
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• Understanding the H-T phase diagram of the mono-axial helimagnet
• Nucleation, instability, and discontinuous phase transitions in monoaxial helimagnets with oblique fields
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• Phase diagram of the (bosonic) Double-Exchange Model
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• Inhomogeneous Phases in a Double-Exchange Magnet with Long Range Coulomb Interactions
• Double-Exchange Model on Triangle Chain