Isospin model for suppression of charge order in hole- doped NaV2O5
Abstract
The layered perovskite compound NaV2O5 exhibits charge ordering (CO) and spin gap formation which is driven by inter- site Coulomb forces and exchange dimerisation. Experimentally it was found that the CO transition is rapidly reduced by doping. Charge ordering in NaV2O5 has a quasi 1D character due to inter- ladder frustration in the Trellis lattice. Based on an extended pseudospin (T=1) approach for hole doped NaV2O5 ladders we construct an Ising like model that explains qualitatively the destruction of the CO phase as function of hole doping δ and show how the CO parameter depends on δ and the ratio of Coulomb and hopping energies.
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