Document Type

Article

Publication Version

Published Version

Publication Date

6-15-2015

Journal or Book Title

Physical Review B

Volume

91

Issue

24

First Page

245155

DOI

10.1103/PhysRevB.91.245155

Abstract

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 also 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. These results set the stage for a comprehensive understanding of complex energy landscapes that may not be readily determined by macroscopic approaches.

Comments

This article was published in Physical Review B 91 (2015): 245155, doi:10.1103/PhysRevB.91.245155. Posted with permission

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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