Competition between instabilities of Peierls transition and Mott transition in W-doped VO2 thin films

Enju Sakai, Kohei Yoshimatsu, Keisuke Shibuya, Hiroshi Kumigashira, Eiji Ikenaga, Masashi Kawasaki, Yoshinori Tokura, Masaharu Oshima

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

The change in electronic structure of V1-xWxO 2 thin films across a metal-insulator transition (MIT) is investigated in terms of hard x-ray photoemission spectroscopy and x-ray absorption spectroscopy. In the lower doping range (0 ≤ x ≤ 0.08), the spectra exhibit the characteristic features for the dimerization of V ions in the monoclinic phase, indicating that Peierls-like instability predominately causes the MIT in this range. Conversely, in the higher doping range (0.1 ≤ x), spectral weight transfer is observed from the coherent part at the Fermi level to the incoherent part, indicating that the ground state of V 1-xWxO2 films in this range is a typical Mott insulator. The results suggest that the unusual phase diagram of the V 1-xWxO2 thin films originates from the competition between the Peierls and Mott instabilities.

Original languageEnglish
Article number195132
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number19
DOIs
Publication statusPublished - 2011 Nov 28
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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