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Title: Large epitaxial bi-axial strain induces a Mott-like phase transition in VO{sub 2}

The metal insulator transition (MIT) in vanadium dioxide (VO{sub 2}) has been an important topic for recent years. It has been generally agreed upon that the mechanism of the MIT in bulk VO{sub 2} is considered to be a collaborative Mott-Peierls transition, however, the effect of strain on the phase transition is much more complicated. In this study, the effect of the large strain on the properties of VO{sub 2} films was investigated. One remarkable result is that highly strained epitaxial VO{sub 2} thin films were rutile in the insulating state as well as in the metallic state. These highly strained VO{sub 2} films underwent an electronic phase transition without the concomitant Peierls transition. Our results also show that a very large tensile strain along the c-axis of rutile VO{sub 2} resulted in a phase transition temperature of ∼433 K, much higher than in any previous report. Our findings elicit that the metal insulator transition in VO{sub 2} can be driven by an electronic transition alone, rather the typical coupled electronic-structural transition.
Authors:
 [1] ;  [1] ;  [2] ;  [3]
  1. Department of Physics, University of Virginia, Charlottesville, Virginia 22904 (United States)
  2. (United States)
  3. Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904 (United States)
Publication Date:
OSTI Identifier:
22310911
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 7; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; EPITAXY; METALS; PHASE TRANSFORMATIONS; STRAINS; THIN FILMS; TRANSITION TEMPERATURE; VANADIUM OXIDES