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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
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Sequential electronic and structural transitions in VO2 observed using X-ray absorption spectromicroscopy.

Suhas Kumar1, John Paul Strachan, Matthew D Pickett

  • 1Hewlett Packard Laboratories, 1501 Page Mill Road, Palo Alto, CA, 94304, USA; Stanford University, Stanford, CA, 94305, USA.

Advanced Materials (Deerfield Beach, Fla.)
|October 17, 2014
PubMed
Summary

The electronic transition in vanadium dioxide (VO2) occurs before the structural Peierls transition during heating and cooling. Intermediate states between these transitions were identified.

Keywords:
X-ray spectroscopymott transitionpeierls transitionvanadium oxide

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid-State Chemistry

Background:

  • Vanadium dioxide (VO2) exhibits a unique coupled electronic and structural phase transition near room temperature.
  • Understanding the interplay between electronic and structural changes is crucial for VO2 applications.
  • Previous studies have investigated the transitions, but the precise sequence and intermediate states remain areas of active research.

Purpose of the Study:

  • To precisely determine the sequence of electronic and structural transitions in VO2.
  • To identify and characterize any intermediate states occurring between the electronic and structural transitions.
  • To leverage advanced X-ray techniques for high-resolution analysis of the VO2 phase transition.

Main Methods:

  • Utilized X-ray absorption spectromicroscopy (XAS) to probe the electronic and structural properties of VO2.
  • Employed high spatial and spectral resolution capabilities of XAS for detailed analysis.
  • Performed in-situ heating and cooling experiments to observe the transitions dynamically.

Main Results:

  • The electronic transition consistently precedes the structural Peierls transition during both heating and cooling cycles.
  • Distinct intermediate states were spectrally isolated and identified between the electronic and structural transitions.
  • High-resolution XAS provided unprecedented detail on the transition dynamics and intermediate phases.

Conclusions:

  • The findings clarify the fundamental sequence of the coupled phase transitions in VO2.
  • The identification of intermediate states opens new avenues for understanding VO2's complex behavior.
  • This work provides critical insights for the design and application of VO2-based devices.