Island phases and charge order in two-dimensional manganites

Details Island phases and charge order in two-dimensional manganites Island phases and charge order in two-dimensional manganites

2000-11-20

arxiv.org/abs/cond-mat/0011342v2

Phys. Rev. B 64, 024422 (2001).

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 17 figures

Scientific paper

10.1103/PhysRevB.64.024422

The ferromagnetic Kondo lattice model with an antiferromagnetic interaction between localized spins is a minimal description of the competing kinetic t and magnetic K energy terms which generate the rich physics of manganite systems. Motivated by the discovery in one dimension of homogeneous ``island phases'', we consider the possibility of analogous phases in higher dimensions. We characterize the phases present at commensurate fillings, and consider in detail the effects of phase separation in all filling and parameter regimes. We deduce that island and flux phases are stable for intermediate values of K/t at the commensurate fillings n = 1/4, 1/3, 3/8, and 1/2. We discuss the connection of these results to the charge and magnetic ordering observed in a wide variety of manganite compounds.

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