Evolution of the electronic structure of a Mott system across its phase diagram

• Verfasst von: Rodolakis, Fanny [VerfasserIn]
• Verfasst von: Haverkort, Maurits W. [VerfasserIn]
• Titel: Evolution of the electronic structure of a Mott system across its phase diagram
• Titelzusatz: X-ray absorption spectroscopy study of (V 1-xCr x) 2O 3
• Verf.angabe: F. Rodolakis, J.-P. Rueff, M. Sikora, I. Alliot, J.-P. Itié, F. Baudelet, S. Ravy, P. Wzietek, P. Hansmann, A. Toschi, M.W. Haverkort, G. Sangiovanni, K. Held, P. Metcalf, and M. Marsi
• Fussnoten: Im Titel sind die Ziffern und Buchstaben 1−x, x, 2 und 3 tiefgestellt ; Gesehen am 03.11.2017
• Titel Quelle: Enthalten in: Physical review / B
• Jahr Quelle: 2011
• Band/Heft Quelle: 84(2011,24) Artikel-Nummer 245113, 10 Seiten
• ISSN Quelle: 1550-235X
• DOI: doi:10.1103/PhysRevB.84.245113
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1564977323

Abstract

V2O3 is an archetypal system for the study of correlation-induced, Mott-Hubbard metal-insulator transitions. Despite decades of extensive investigations, the accurate description of its electronic properties remains an open problem in the physics of strongly correlated materials, also because of the lack of detailed experimental data on its electronic structure over the whole phase diagram. We present here a high-resolution x-ray absorption spectroscopy study at the V K edge of (V1−xCrx)2O3 to probe its electronic structure as a function of temperature, doping, and pressure, providing an accurate picture of the electronic changes over the whole phase diagram. We also discuss the relevance of the parallel evolution of the lattice parameters, determined with x-ray diffraction. This allows us to draw two conclusions of general interest: First, the transition under pressure presents peculiar properties, related to a more continuous evolution of the lattice and electronic structure; second, the lattice mismatch is a good parameter describing the strength of the first-order transition, and is consequently related to the tendency of the system toward the coexistence of different phases. Our results show that the evolution of the electronic structure while approaching a phase transition, and not only while crossing it, is also a key element to unveil the underlying physical mechanisms of Mott materials.