Abstract
We present a detailed study of the valence and conduction bands of across the metal-insulator transition using bulk-sensitive photoelectron and O x-ray absorption spectroscopies. We observe a giant transfer of spectral weight with distinct features that require an explanation which goes beyond the Peierls transition model as well as the standard single-band Hubbard model. Analysis of the symmetry and energies of the bands reveals the decisive role of the V orbital degrees of freedom. Comparison to recent realistic many body calculations shows that much of the dependence of the self-energy correction can be cast within a dimer model.
- Received 25 April 2006
DOI:https://doi.org/10.1103/PhysRevLett.97.116402
©2006 American Physical Society