Quasiparticle evolution and pseudogap formation in V 2 O 3 : An infrared spectroscopy study
2008; American Physical Society; Volume: 77; Issue: 11 Linguagem: Inglês
10.1103/physrevb.77.113107
ISSN1550-235X
AutoresLeonetta Baldassarre, A. Perucchi, D. Nicoletti, A. Toschi, Giorgio Sangiovanni, Karsten Held, Massimo Capone, Michele Ortolani, Lorenzo Malavasi, M. Marsi, P. Metcalf, P. Postorino, S. Lupi,
Tópico(s)Electronic and Structural Properties of Oxides
ResumoThe infrared conductivity of ${\mathrm{V}}_{2}{\mathrm{O}}_{3}$ is measured in the whole phase diagram. Quasiparticles appear above the N\'eel temperature ${T}_{N}$ and eventually disappear further enhancing the temperature, leading to a pseudogap in the optical spectrum above $425\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. Our calculations demonstrate that this loss of coherence can be explained only if the temperature dependence of lattice parameters is considered. ${\mathrm{V}}_{2}{\mathrm{O}}_{3}$ is therefore effectively driven from the ``metallic'' to the ``insulating'' side of the Mott transition as the temperature is increased.
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