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Article
Stability of the M2 Phase of Vanadium Dioxide Induced by Coherent Epitaxial Strain
Physical Review B
  • N. F. Quackenbush
  • Yijia Gu, Missouri University of Science and Technology
  • For full list of authors, see publisher's website., For full list of authors, see publisher's website.
Abstract

Tensile strain along the cR axis in epitaxial VO2 films raises the temperature of the metal insulator transition and is expected to stabilize the intermediate monoclinic M2 phase. We employ surface-sensitive x-ray spectroscopy to distinguish from the TiO2 substrate and identify the phases of VO2 as a function of temperature in epitaxial VO2/TiO2 thin films with well-defined biaxial strain. Although qualitatively similar to our Landau-Ginzburg theory predicted phase diagrams, the M2 phase is stabilized by nearly an order of magnitude more strain than expected for the measured temperature window. Our results reveal that the elongation of the cR axis is insufficient for describing the transition pathway of VO2 epitaxial films and that a strain induced increase of electron correlation effects must be considered.

Department(s)
Materials Science and Engineering
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2016 American Physical Society (APS), All rights reserved.
Publication Date
8-1-2016
Citation Information
N. F. Quackenbush, Yijia Gu and For full list of authors, see publisher's website.. "Stability of the M2 Phase of Vanadium Dioxide Induced by Coherent Epitaxial Strain" Physical Review B Vol. 94 Iss. 8 (2016) ISSN: 2469-9950; 2469-9969
Available at: http://works.bepress.com/yijia-gu/68/