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Surface Effects on the Mott-Hubbard Transition in Archetypal V{2}O{3}
G Lantz1, M Hajlaoui1, E Papalazarou1
1Laboratoire de Physique des Solides, CNRS-UMR 8502, Université Paris-Sud, F-91405 Orsay, France.
Surface orientation influences metal-insulator transitions in Cr-doped V2O3. Defects at the surface promote metallic domain formation, explained by theoretical modeling of surface reconstruction.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Surface Science
Background:
- The Mott-Hubbard transition in correlated electron systems like Cr-doped V2O3 is crucial for understanding electronic phase behavior.
- Surface effects can significantly alter bulk material properties, particularly in transition metal oxides.
Purpose of the Study:
- To investigate the impact of surface crystallographic orientation on the metal-insulator transition in Cr-doped V2O3.
- To elucidate the role of surface defects and reconstruction in the formation of metallic domains.
Main Methods:
- Experimental techniques: Scanning photoelectron microscopy (SPM) and X-ray diffraction (XRD).
- Theoretical approach: Density-functional theory (DFT) combined with dynamical mean-field theory (DMFT).
Main Results:
- Microscopic domain formation during the temperature-induced isostructural transition is strongly dependent on surface crystallographic orientation.
- Surface defects act as nucleation sites for domain formation and promote the emergence of microscopic metallic regions.
- Theoretical calculations reveal that surface reconstruction with excess vanadyl cations leads to doped, metallic surface states.
Conclusions:
- Surface structure and defects play a critical role in modulating the metal-insulator transition in Cr-doped V2O3.
- The observed surface effects are consistent with theoretical predictions of enhanced metallicity due to surface reconstruction.
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