Spin-Isospin Model of NaV_2O_5

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dc.creatorMostovoy, M. V.
dc.creatorKnoester, J.
dc.creatorKhomskii, D. I.
dc.date2000-09-29
dc.date.accessioned2026-07-07T02:38:52Z
dc.date.available2026-07-07T02:38:52Z
dc.descriptionWe argue that in the quarter-filled ladder compound NaV_2O_5 the quasi-one-dimensional spin system is strongly coupled to a low-energy antiferroelectric mode of the excitonic type. This mode results from the interplay between the electron hopping along the rungs of the vanadium two-leg ladders and the Coulomb repulsion between electrons. The charge ordering observed in sodium vanadate at T_c = 34K corresponds to the softening of the antiferroelectric mode. We consider the spin-isospin model, which describes the spin and low-energy charge degrees of freedom in sodium vanadate. Within this model we explain the observed anomalous temperature-dependence of the dielectric susceptibility at T_c and the midinfrared absorption continuum. We identify the broad structure in the low-energy optical absorption spectrum of NaV_2O_5 with the continuum formed by two spinons and one low-energy charge excitation.
dc.description30 pages, 12 figures, submitted to Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/0009464
dc.identifierhttp://arxiv.org/abs/cond-mat/0009464
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/16842
dc.subjectStrongly Correlated Electrons
dc.subjectStatistical Mechanics
dc.titleSpin-Isospin Model of NaV_2O_5
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