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Optical properties of V2O3 in its whole phase diagram

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

Fulltext (public)

PhysRevB.91.155133.pdf
(Publisher version), 2MB

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Citation

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
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.