Abstract
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 acertain amount of thermally activated defects arises from the spatial ordering of preexisting, randomly distributed polarons. Properties of this particular CO state give a qualitative understanding of the low frequency behavior of optical conductivity of Ni perovskites.
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Ciuchi, S., de Pasquale, F. (2002). The Charge-Ordered State from Weak to Strong Coupling. In: Bianconi, A., Saini, N.L. (eds) Stripes and Related Phenomena. Selected Topics in Superconductivity, vol 8. Springer, Boston, MA. https://doi.org/10.1007/0-306-47100-0_22
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DOI: https://doi.org/10.1007/0-306-47100-0_22
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