Electronic phase separation in the pyrochlore double-exchange model

Abstract

Electronic phase separation and related inhomogeneity is ubiquitously seen in strongly-correlated systems. A typical example is found between ferromagnetic metal and antiferromagnetic insulator in CMR manganese oxides. Here we demonstrate that the geometrical frustration brings distinctive aspects into the phase separation phenomena. From Monte Carlo simulation and a simple energy comparison for the pyrochlore double-exchange model, we show that such phase separation takes place between ferromagnetic and paramagnetic metals. We discuss the relevance of our results to a spin-glassy metallic phase found in Mo pyrochlore oxides under external pressure.

5 pages, 4 figures, accepted for publication in Phys. Rev. B (Rapid Commun.)

References in corpus (4)

• Phase competition in the double-exchange model on the frustrated pyrochlore lattice
• Phase separation in a two-band model for strongly correlated electrons
• Long Range Coulomb Interactions and Nanoscale Electronic Inhomogeneities in Correlated Oxides
• Ferromagnetic transition in the double-exchange model on the pyrochlore lattice

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• Orbital degeneracy and Mott transition in Mo pyrochlore oxides
• Spin-orbital liquids and insulator-metal transitions on the pyrochlore lattice
• Polynomial Expansion Monte Carlo Study of Frustrated Itinerant Electron Systems: Application to a Spin-ice type Kondo Lattice Model on a Pyrochlore Lattice
• Monte Carlo Study of an Effective Ising Model for the Spin-ice type Kondo Lattice Model
• Mott transition and anomalous resistive state in the pyrochlore molybdates
• Robust noncoplanar magnetism in band filling-tuned (Nd${}_{1-x}$Ca${}_x$)${}_2$Mo${}_2$O${}_7$
• Application of polynomial-expansion Monte Carlo method to a spin-ice Kondo lattice model
• Double exchange model on triangular lattice: non-coplanar spin configuration and phase transition near quarter filling