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Title: Transport properties of ultra-thin VO{sub 2} films on (001) TiO{sub 2} grown by reactive molecular-beam epitaxy

We report the growth of (001)-oriented VO{sub 2} films as thin as 1.5 nm with abrupt and reproducible metal-insulator transitions (MIT) without a capping layer. Limitations to the growth of thinner films with sharp MITs are discussed, including the Volmer-Weber type growth mode due to the high energy of the (001) VO{sub 2} surface. Another key limitation is interdiffusion with the (001) TiO{sub 2} substrate, which we quantify using low angle annular dark field scanning transmission electron microscopy in conjunction with electron energy loss spectroscopy. We find that controlling island coalescence on the (001) surface and minimization of cation interdiffusion by using a low growth temperature followed by a brief anneal at higher temperature are crucial for realizing ultrathin VO{sub 2} films with abrupt MIT behavior.
Authors:
;  [1] ; ;  [2] ;  [3] ;  [4] ;  [5] ; ; ;  [6] ; ;  [7] ; ;  [8] ;  [5] ;  [3] ;  [1] ;  [3]
  1. Department of Material Science and Engineering, Cornell University, Ithaca, New York 14853 (United States)
  2. Department of Physics, University of Illinois Urbana-Champaign, Urbana, Illinois 61801 (United States)
  3. (United States)
  4. Materials Research Laboratory, University of Illinois Urbana-Champaign, Urbana, Illinois 61801 (United States)
  5. School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853 (United States)
  6. Department of Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
  7. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
  8. Peter Grünberg Institute (PGI9-IT), JARA-Fundamentals of Future Information Technologies, Research Centre Jülich, D-52425 Jülich (Germany)
Publication Date:
OSTI Identifier:
22485941
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 16; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CATIONS; COALESCENCE; ENERGY-LOSS SPECTROSCOPY; FILMS; LAYERS; MOLECULAR BEAM EPITAXY; PHASE TRANSFORMATIONS; SUBSTRATES; SURFACES; TITANIUM OXIDES; TRANSMISSION ELECTRON MICROSCOPY; VANADIUM OXIDES