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Title: Phase transition in bulk single crystals and thin films of VO2 by nanoscale infrared spectroscopy and imaging

We have systematically studied a variety of vanadium dioxide (VO2) crystalline forms, including bulk single crystals and oriented thin films, using infrared (IR) near-field spectroscopic imaging techniques. By measuring the IR spectroscopic responses of electrons and phonons in VO2 with sub-grain-size spatial resolution (~20nm), we show that epitaxial strain in VO2 thin films not only triggers spontaneous local phase separations, but leads to intermediate electronic and lattice states that are intrinsically different from those found in bulk. Generalized rules of strain- and symmetry-dependent mesoscopic phase inhomogeneity are also discussed. Furthermore, these results set the stage for a comprehensive understanding of complex energy landscapes that may not be readily determined by macroscopic approaches.
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [4] ;  [5] ;  [6] ;  [2] ;  [2] ;  [7] ;  [8] ;  [2] ;  [2] ;  [2] ;  [5] ;  [9] ;  [9] ;  [10] ;  [2] more »;  [5] ;  [11] ;  [4] ;  [2] « less
  1. Univ. of California at San Diego, La Jolla, CA (United States); Stony Brook Univ., Stony Brook, NY (United States)
  2. Univ. of California at San Diego, La Jolla, CA (United States)
  3. Metal-Insulator Transition Creative Research Center, Daejeon (South Korea)
  4. Iowa State Univ., Ames, IA (United States)
  5. Univ. of Virginia, Charlottesville, VA (United States)
  6. College of William and Mary, Williamsburg, VA (United States)
  7. Boston Univ., Boston, MA (United States); ETH Zurich, Zurich (Switzerland)
  8. Univ. of California at San Diego, La Jolla, CA (United States); Boston Univ., Boston, MA (United States)
  9. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  10. Univ. of Colorado, Boulder, CO (United States)
  11. Metal-Insulator Transition Creative Research Center, Daejeon (South Korea); Korean Univ. of Science and Technology, Daejeon (South Korea)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 1098-0121; PRBMDO
Grant/Contract Number:
W911NF-13-1-0210; AC02-05CH11231; AC02-07CH11358; SC0012592; FG02-09ER46643; 1255156
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 91; Journal Issue: 24; Journal ID: ISSN 1098-0121
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States