Coulomb Interactions and Nanoscale Electronic Inhomogeneities in Manganites

Details Coulomb Interactions and Nanoscale Electronic Inhomogeneities in Manganites Coulomb Interactions and Nanoscale Electronic Inhomogeneities in Manganites

2006-06-26

arxiv.org/abs/cond-mat/0606660v1

Phys. Rev. Lett., 98, 097201 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.98.097201

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.

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