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Journal Article

Optical properties of V2O3 in its whole phase diagram


Nicoletti,  Daniele
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Lo Vecchio, I., Baldassarre, L., D’Apuzzo, F., Limaj, O., Nicoletti, D., Perucchi, A., et al. (2015). Optical properties of V2O3 in its whole phase diagram. Physical Review B, 91(15): 155133. doi:10.1103/PhysRevB.91.155133.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-7EA0-2
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.