Near degeneracy and pseudo Jahn-Teller effects in mixed-valence ladders: the phase transition in NaV${}_2$O${}_5$

Abstract

We analyze the electronic structure of a mixed-valence ladder system. We find that structural anisotropy and complex electron correlations lead to on-rung charge localization and insulating character. Charge fluctuations within the rung of the ladder interact strongly to the lattice degrees of freedom, which gives rise to large pseudo Jahn--Teller effects. The phase transition in NaV${}_2$O${}_5$ should be driven by this kind of mechanism.

5 pages, 2 figures, 1 table, submitted to PRL

References in corpus (2)

• The density-matrix renormalization group
• Electron correlations and bond-length fluctuations in copper oxides: from Zhang--Rice singlets to correlation bags

Cited by in corpus (1)

• Electron correlations and bond-length fluctuations in layered copper oxides: electron versus hole doping