Spin Waves, Phase Separation, and Interphase Boundaries in Double Exchange Magnets

Abstract

We study a classical double exchange magnet with direct antiferromagnetic superexchange coupling, J, between the localized spins. It is shown that the de-stabilization of the ferromagnetic ground state with increasing J leads to phase separation; the latter always preempts the spin-wave instability (softening of the magnon spectrum). It is also found that the boundaries separating the ferromagnetic and antiferromagnetic areas of the sample tend to be abrupt.

3 pages, LaTeX-Revtex, 2 PostScript figures; misprints corrected, including those in the published version

References in corpus (1)

• Monte Carlo determination of the phase diagram of the double-exchange model

Cited by in corpus (10)

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• Spin Dynamics of Double-Exchange Manganites with Magnetic Frustration
• Boundary Energies and the Geometry of Phase Separation in Double--Exchange Magnets
• Double Exchange in a Magnetically Frustrated System
• Inhomogeneous Phases in a Double-Exchange Magnet with Long Range Coulomb Interactions
• Double-Exchange Model on Triangle Chain
• Excitonic Insulator and the Extended Falicov--Kimball Model Away from Half-Filling