Phase separation in systems with charge ordering

Abstract

A simple model of charge ordering is considered. It is shown explicitly that at any deviation from half-filling ($n\ne 1/2$) the system is unstable with respect to phase separation into charge ordered regions with $n=1/2$ and metallic regions with smaller electron or hole density. Possible structure of this phase-separated state (metallic droplets in a charge-ordered matrix)is discussed. The model is extended to account for the strong Hund-rule onsite coupling and the weaker intersite antiferromagnetic exchange. An analysis of this extended model allows us to determine the magnetic structure of the phase-separated state and to reveal the characteristic features of manganites and other substances with charge ordering.

9 pages, revtex

References in corpus (6)

• Charge and orbital order in half-doped manganites
• Ferromagnetic, A-type, and Charge-Ordered CE-type States in Doped Manganites using Jahn-Teller Phonons
• Ferromagnetism and superstructure in Ca_{1-x}La_xB_6
• Phase separation, percolation and giant isotope effect in manganites
• Origin of the Charge-Orbital Stripe Structure in La_(1-x)Ca_(x)MnO_(3) (x=1/2, 2/3)
• Charge and magnetic order in two-orbital double-exchange model for manganites

Cited by in corpus (19)

• Atomic-scale images of charge ordering in a mixed-valence manganite
• Elastic interaction and superstructures in manganites and other Jahn-Teller systems
• Superinsulator-Superconductor Duality in Two Dimensions
• Electronic phase separation: recent progress in the old problem
• Phase separation in doped systems with spin-state transitions
• Nanoscale phase separation in manganites
• The Feshbach resonance and nanoscale phase separation in a polaron liquid near the quantum critical point for a polaron Wigner crystal
• Triplet p-wave superconductivity in low-density extended Hubbard model with Coulomb repulsion
• Jahn-Teller distortions and phase separation in doped manganites
• Maltese Cross anisotropy in Ho0.8Lu0.2B12 antiferromagnetic metal with dynamic charge stripes
• Magnetic, orbital and charge ordering in the electron-doped manganites
• Charge transport in Ho${}_x$Lu${}_{1-x}$B${}_{12}$: Separating Positive and Negative Magnetoresistance in Metals with Magnetic Ions
• Non-magnetic B-site Impurities Induce Ferromagnetic Tendencies in CE Manganites
• Partially gapped fermions in 2D
• Evidence of symmetry lowering in antiferromagnetic metal TmB12 with dynamic charge stripes
• Droplets of the order parameter in a low density attracting electron system in the presence of a strong random potential
• Orbital physics of polar Fermi molecules
• Charge ordering in half-doped Pr(Nd)${}_{0.5}$Ca${}_{0.5}$MnO${}_3$ under magnetic field
• Universality and critical behavior of the dynamical Mott transition in a system with long-range interactions