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Electron-electron and electron-phonon interaction in the metal to insulator transition in vanadium oxides

Leonetta Baldassarre - Sincrotrone Trieste S.C.p.A., Area Science Park, Basovizza Italy


Several families of vanadium oxides display metal to insulator transitions (MIT) often driven by both temperature (T) and pressure (P) with jumps of conductivity up to 7 orders of magnitude [1].

 

Despite that the MIT has been widely investigated in several of these compounds the mechanism that drives the electronic transition in several of the vanadium oxides belonging to the Magnéli phase is still unclear and probably determined by an interplay between electron-phonon and electron-electron interactions.

 

Here we present a complete investigation of MIT as a function of T and P, by measuring the optical properties of single crystals of VO2,V2O3, (V0.989Cr0.011)2O3, and V3O5. Measurements have been performed in a wide range of T (10-600 K) and P (0-15 GPa) in order to cover the rich phase diagrams of those materials.

 

[1] M. Imada et al., Rev, Mod. Phys. 70, 1039 (1998).

 

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