Band structure and questioned dimensionality of
Departement Natuurkunde, Universiteit Antwerpen (UIA)
Universiteitsplein 1. B-2610 Antwerpen, Belgium
2 Departement Natuurkunde, Katholieke Universiteit Leuven Celestijnenlaan 200D, B-3001 Leuven, Belgium
Accepted: 12 July 2001
is classified as a dimerized layered system with strongly interacting d-electrons of vanadium ions. The derived band gaps, energy dispersion relations and density of electronic states are in good agreement with available experimental and theoretical data. The correlated band gap provides the insulating state of the high-temperature phase whereas the state, earlier misinterpreted as the spin-Peierls state, is governed, in fact, by the opening of the Coulomb gap.
PACS: 71.20.Ps – Other inorganic compounds / 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.30.+h – Metal-insulator transitions and other electronic transitions
© EDP Sciences, 2001