The infrared conductivity of V2O3 is measured in the whole phase diagram. Quasiparticles appear above the Néel 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.
Quasiparticle evolution and pseudogap formation in V(2)O(3): An infrared spectroscopy study / Baldassarre, Leonetta; A., Perucchi; Nicoletti, Daniele; A., Toschi; G., Sangiovanni; K., Held; M., Capone; Ortolani, Michele; L., Malavasi; M., Marsi; P., Metcalf; Postorino, Paolo; Lupi, Stefano. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 77:(2008), pp. 113107-1-113107-4. [10.1103/PhysRevB.77.113107]
Quasiparticle evolution and pseudogap formation in V(2)O(3): An infrared spectroscopy study
BALDASSARRE, Leonetta;NICOLETTI, DANIELE;ORTOLANI, MICHELE;POSTORINO, Paolo;LUPI, Stefano
2008
Abstract
The infrared conductivity of V2O3 is measured in the whole phase diagram. Quasiparticles appear above the Néel 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
