Orbital-assisted metal-insulator transition in VO$_{2}$

Details Orbital-assisted metal-insulator transition in VO$_{2}$ Orbital-assisted metal-insulator transition in VO$_{2}$

2005-09-14

arxiv.org/abs/cond-mat/0509368v1

Phys. Rev. Lett. 95, 196404 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.95.196404

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.

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