Insulating phases of vanadium dioxide are Mott-Hubbard insulators

T. J. Huffman, C. Hendriks, E. J. Walter, Joonseok Yoon, Honglyoul Ju, R. Smith, G. L. Carr, H. Krakauer, M. M. Qazilbash

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Abstract

We present comprehensive broadband optical spectroscopy data on two insulating phases of vanadium dioxide (VO2): monoclinic M2 and triclinic. The main result of our work is that the energy gap and the electronic structure are essentially unaltered by the first-order structural phase transition between the M2 and triclinic phases. Moreover, the optical interband features in the M2 and triclinic phases are remarkably similar to those observed in the well-studied monoclinic M1 insulating phase of VO2. As the energy gap is insensitive to the different lattice structures of the three insulating phases, we rule out vanadium-vanadium pairing (the Peierls component) as the dominant contributor to the opening of the gap. Rather, the energy gap arises primarily from intra-atomic Coulomb correlations.

Original languageEnglish
Article number075125
JournalPhysical Review B
Volume95
Issue number7
DOIs
Publication statusPublished - 2017 Feb 15

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Huffman, T. J., Hendriks, C., Walter, E. J., Yoon, J., Ju, H., Smith, R., Carr, G. L., Krakauer, H., & Qazilbash, M. M. (2017). Insulating phases of vanadium dioxide are Mott-Hubbard insulators. Physical Review B, 95(7), [075125]. https://doi.org/10.1103/PhysRevB.95.075125