Inhomogeneous Phases in a Double-Exchange Magnet with Long Range Coulomb Interactions

Details Inhomogeneous Phases in a Double-Exchange Magnet with Long Range Coulomb Interactions Inhomogeneous Phases in a Double-Exchange Magnet with Long Range Coulomb Interactions

2008-08-17

arxiv.org/abs/0808.2290v2

Phys. Rev. B 78, 184433 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

15 pages, 9 figures. Journal Ref. added, errors corrected

Scientific paper

10.1103/PhysRevB.78.184433

We consider a model with competing double-exchange (ferromagnetic) and super-exchange (anti-ferromagnetic) interactions in the regime where phase separation takes place. The presence of a long range Coulomb interaction frustrates a macroscopic phase separation, and favors microscopically inhomogeneous configurations. We use the variational Hartree-Fock approach, in conjunction with Monte-Carlo simulations to study the geometry of such configurations in a two-dimensional system. We find that an array of diamond shaped ferromagnetic droplets is the preferred configuration at low electronic densities, while alternating ferromagnetic and anti-ferromagnetic diagonal stripes emerge at higher densities. These findings are expected to be relevant for thin films of colossal magneto-resistive manganates.

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