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Stability of the M2 phase of vanadium dioxide induced by coherent epitaxial strain

DOI: 10.1103/PhysRevB.94.085105 DOI Help

Authors: Nicholas Quackenbush (Binghamton University) , H. Paik (Department of Materials Science and Engineering, Cornell Univ) , Matthew Wahila (Binghamton University) , Shawn Sallis (Binghamton University) , M. E. Holtz (School of Applied and Engineering Physics, Cornell University; Kavli Institute at Cornell for Nanoscale Science) , X. Huang (School of Applied and Engineering Physics, Cornell University) , A. Ganose (University College London; Diamond Light Source) , B. J. Morgan (Department of Chemistry, University of Bath) , David O. Scanlon (University College London; Diamond Light Source) , Y. Gu (Department of Materials Science and Engineering, The Pennsylvania State University) , F. Xue (Department of Materials Science and Engineering, The Pennsylvania State University) , L.-q. Chen (Department of Materials Science and Engineering, The Pennsylvania State University) , G. E. Sterbinsky (National Synchrotron Light Source, Brookhaven National Laboratory) , Christoph Schlueter (Diamond Light Source) , Tien-lin Lee (Diamond Light Source) , J. C. Woicik (Materials Science and Engineering Laboratory, National Institute of Standards and Technology) , J.-h. Guo (Advanced Light Source, Lawrence Berkeley National Laboratory) , J. D. Brock (School of Applied and Engineering Physics; Cornell High Energy Synchrotron Source, Cornell University) , D. A. Muller (School of Applied and Engineering Physics, Cornell University; Kavli Institute at Cornell for Nanoscale Science) , D. A. Arena , D. G. Schlom (Department of Physics, University of South Florida) , Louis Piper (Binghamton University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 94

State: Published (Approved)
Published: August 2016
Diamond Proposal Number(s): 12546

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.

Subject Areas: Physics


Instruments: I09-Surface and Interface Structural Analysis

Other Facilities: Advanced Light Source (ALS); National Synchrotron Light Source (NSLS)