Optical properties of V2O3 in its whole phase diagram

Lo Vecchio, I.; Baldassarre, L.; D’Apuzzo, F.; Limaj, O.; Nicoletti, Daniele; Perucchi, A.; Fan, L.; Metcalf, P.; Marsi, M.; Lupi, S.

doi:10.1103/PhysRevB.91.155133

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学術論文

Optical properties of V₂O₃ in its whole phase diagram

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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;

External Resource

http://dx.doi.org/10.1103/PhysRevB.91.155133
(出版社版)

http://arxiv.org/abs/1504.07279
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PhysRevB.91.155133.pdf
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引用

Lo Vecchio, I., Baldassarre, L., D’Apuzzo, F., Limaj, O., Nicoletti, D., Perucchi, A., Fan, L., Metcalf, P., Marsi, M., & Lupi, S. (2015). Optical properties of V₂O₃ in its whole phase diagram. Physical Review B, 91(15):. doi:10.1103/PhysRevB.91.155133.

引用: https://hdl.handle.net/11858/00-001M-0000-0027-7EA0-2

要旨

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 (V_1-xM_x)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.