Abstract:
An effective intra- and inter-ladder charge-spin Hamiltonian for the quarter-filled ladder compound α'-NaV2O5 has been derived by using the standard canonical transformation method. In the derivation, it is clear that a finite inter-site Coulomb repulsion is needed to get a meaningful result otherwise the perturbation becomes ill-defined. Various limiting cases depending on the values of the model parameters have been analyzed in detail and the effective exchange couplings are estimated. We find that the effective intra-ladder exchange may become ferromagnetic for the case of zig-zag charge ordering in a purely electronic model. We estimate the magnitude of the effective inter-rung Coulomb repulsion in a ladder and find it to be about one-order of magnitude too small in order to stabilize charge-ordering.
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Received 24 March 2000 and Received in final form 30 August 2000
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Sa, D., Gros, C. Effective charge and spin Hamiltonian for the quarter-filled ladder compound α'-NaV2O5 . Eur. Phys. J. B 18, 421–428 (2000). https://doi.org/10.1007/s100510070028
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DOI: https://doi.org/10.1007/s100510070028