The Charge Ordered State from Weak to Strong Coupling

Details The Charge Ordered State from Weak to Strong Coupling The Charge Ordered State from Weak to Strong Coupling

1998-12-24

arxiv.org/abs/cond-mat/9812393v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, to be published in J. of Superconductivity (proceedings Stripes 98)

Scientific paper

10.1103/PhysRevB.59.5431

We apply the Dynamical Mean Field Theory to the problem of charge ordering. In the normal state as well as in the Charge Ordered (CO) state the existence of polarons, i.e. electrons strongly coupled to local lattice deformation, is associated to the qualitative properties of the Lattice Polarization Distribution Function (LPDF). At intermediate and strong coupling a CO state characterized by a certain amount of thermally activated defects arise from the spatial ordering of preexisting randomly distributed polarons. Properties of this particular CO state gives a qualitative understanding of the low frequency behavior of optical conductivity of $Ni$ perovskites.

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