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arXiv · 1504.07279

Optical properties of V2O3 in its whole phase diagram

I. Lo Vecchio·L. Baldassarre·F. D'Apuzzo·O. Limaj·D. Nicoletti·A. Perucchi·L. Fan·P. Metcalf·M. Marsi·S. Lupi
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Abstract

Vanadium sesquioxide V2O3 is considered a textbook example of Mott-Hubbard physics. In this paper we present an extended optical study of its whole temperature/doping phase diagram as obtained by doping the pure material with M=Cr or Ti atoms (V1-xMx)2O3. We reveal that its thermodynamically stable metallic and insulating phases, although macroscopically equivalent, show very different low-energy electrodynamics. The Cr and Ti doping drastically change both the antiferromagnetic gap and the paramagnetic metallic properties. A slight chromium content induces a mesoscopic electronic phase separation, while the pure compound is characterized by short-lived quasiparticles at high temperature. This study thus provides a new comprehensive scenario of the Mott-Hubbard physics in the prototype compound V2O3.

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I. Lo Vecchio, L. Baldassarre, F. D'Apuzzo, O. Limaj, D. Nicoletti, A. Perucchi, L. Fan, P. Metcalf, M. Marsi, S. Lupi. 2015-04-27. Optical properties of V2O3 in its whole phase diagram. https://doi.org/10.1103/physrevb.91.155133

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