Orbital-assisted metal-insulator transition in VO${}_2$

Abstract

We found direct experimental evidence for an orbital switching in the V 3d states across the metal-insulator transition in VO${}_2$. We have used soft-x-ray absorption spectroscopy at the V $L_{2,3}$ edges as a sensitive local probe, and have determined quantitatively the orbital polarizations. These results strongly suggest that, in going from the metallic to the insulating state, the orbital occupation changes in a manner that charge fluctuations and effective band widths are reduced, that the system becomes more 1-dimensional and more susceptible to a Peierls-like transition, and that the required massive orbital switching can only be made if the system is close to a Mott insulating regime.

References in corpus (3)

• Dynamical singlets and correlation-assisted Peierls transition in VO2
• Orbitally-driven Peierls state in spinels
• VO2: a two-fluid incoherent metal?

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