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 Karl Franzens University Graz

Graz University of Technology 

"The Mott-Hubbard metal-insulator transition in V2O3 revisited"
Ass. Prof. Dr. Alessandro Toschi
Technical University Wien
17:15 - 18:15 Tuesday 25 March 2014 TUG P2

The isostructural metal-insulator transition in Cr-doped V2O3[1] represents one of the most known textbook examples of a Mott-Hubbard transition between a paramagnetic metal and a paramagnetic insulator driven by electronic correlations. In this talk, after introducing the key-concepts of a Mott-Hubbard transition, I illustrate it through the discussion of the physics of V2O3. This will include a review[2] of recent theoretical calculations as well as experimental findings, which have shed new light on this famous transition. In particular, we have found that the old paradigm of a doping-pressure equivalence does not hold[3], and that a microscale phase separation for Cr-doped V2O3 is actually observed [4].

[1] D.B. McWhan, A. Menth, et al., Phys. Rev. B 7 1920 (1973).
[2] P. Hansmann, A. Toschi, et al., Physica Status Solidi (b), 250 1251 (2013).
[3] F. Rodolakis, P. Hansmann, et al., Physical Review Letters 104 047401 (2010).
[4] S. Lupi, L. Baldassarre, et al., Nature Communication 1 105 (2010).