Boundary Energies and the Geometry of Phase Separation in Double--Exchange Magnets

Details Boundary Energies and the Geometry of Phase Separation in Double--Exchange Magnets Boundary Energies and the Geometry of Phase Separation in Double--Exchange Magnets

2006-01-11

arxiv.org/abs/cond-mat/0601235v2

Phys. Rev. B vol.74, 104403 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, including 4 figures; expanded version

Scientific paper

10.1103/PhysRevB.74.104403

We calculate the energy of a boundary between ferro- and antiferromagnetic regions in a phase separated double-exchange magnet in two and three dimensions. The orientation dependence of this energy can significantly affect the geometry of the phase-separated state in two dimensions, changing the droplet shape and possibly stabilizing a striped arrangement within a certain range of the model parameters. A similar effect, albeit weaker, is also present in three dimensions. As a result, a phase-separated system near the percolation threshold is expected to possess intrinsic hysteretic transport properties, relevant in the context of recent experimental findings.

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