Abstract
The layered perovskite compound NaV 2O 5 exhibits charge ordering (CO) and spin-gap formation which is driven by inter-site Coulomb forces and exchange dimerisation. Experimentally it was found that charge ordering is rapidly suppressed by doping. CO in NaV 2O 5 has a quasi-1D character due to inter-ladder frustration in the Trellis lattice. Based on an extended isospin ( T=1) approach for hole-doped NaV 2O 5 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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