Coulomb Interactions and Nanoscale Electronic Inhomogeneities in Manganites

Abstract

We address the issue of endemic electronic inhomogeneities in manganites using extensive simulations on a new model with Coulomb interactions amongst two electronic fluids, one localized (polaronic), the other extended (band-like), and dopant ions. The long range Coulomb interactions frustrate phase separation induced by the strong on site repulsion between the fluids. A single quantum phase ensues which is intrinsically and strongly inhomogeneous at a nano-scale, but homogeneous on meso-scales, with many characteristics (including colossal responses)that agree with experiments. This, we argue, is the origin of nanoscale inhomogeneities in manganites, rather than phase competition and disorder related effects as often proposed.

4 pages, 3 figures

References in corpus (1)

• Instabilities and Insulator-Metal transitions in Half-Doped Manganites induced by Magnetic-Field and Doping

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• Polaronic state and nanometer-scale phase separation in colossal magnetoresistive manganites
• Phase Diagram of the Attractive Hubbard Model with Inhomogeneous Interactions
• Inhomogeneous Phases in a Double-Exchange Magnet with Long Range Coulomb Interactions