Abstract
The infrared conductivity of is measured in the whole phase diagram. Quasiparticles appear above the Néel temperature and eventually disappear further enhancing the temperature, leading to a pseudogap in the optical spectrum above . Our calculations demonstrate that this loss of coherence can be explained only if the temperature dependence of lattice parameters is considered. is therefore effectively driven from the “metallic” to the “insulating” side of the Mott transition as the temperature is increased.
- Received 14 October 2007
DOI:https://doi.org/10.1103/PhysRevB.77.113107
©2008 American Physical Society