The infrared conductivity of V2O3 is measured in the whole phase diagram. Quasiparticles appear above the Neel temperature TN and eventually disappear further enhancing the temperature, leading to a pseudogap in the optical spectrum above 425 K. Our calculations demonstrate that this loss of coherence can be explained only if the temperature dependence of lattice parameters is considered. V2O3 is therefore effectively driven from the metallic to the insulating side of the Mott transition as the temperature is increased.
@article{arxiv.0710.1247,
title = {Quasiparticle evolution and pseudogap formation in V2O3: An infrared spectroscopy study},
author = {L. Baldassarre and A. Perucchi and D. Nicoletti and A. Toschi and G. Sangiovanni and K. Held and M. Capone and M. Ortolani and L. Malavasi and M. Marsi and P. Metcalf and P. Postorino and S. Lupi},
journal= {arXiv preprint arXiv:0710.1247},
year = {2009}
}