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

TitlePhase transition in bulk single crystals and thin films of VO2 by nanoscale infrared spectroscopy and imaging
Publication TypeJournal Article
Year of Publication2015
AuthorsLiu, MK, Sternbach, AJ, Wagner, M, Slusar, TV, Kong, T, Bud'ko, SL, Kittiwatanakul, S, Qazilbash, MM, McLeod, A, Fei, Z, Abreu, E, Zhang, JD, Goldflam, M, Dai, SY, Ni, GX, Lu, JW, Bechtel, HA, Martin, MC, Raschke, MB, Averitt, RD, Wolf, SA, Kim, HT, Canfield, PC, Basov, DN
JournalPhysical Review B
Volume91
Pagination245155
Date Published06
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000357025800003
Keywordsanisotropy, domains, metal-insulator-transition, microscopy, resistance, resistivity, self-organization, strain, temperature, vanadium dioxide
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 (similar to 20 nm), 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.

DOI10.1103/PhysRevB.91.245155
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Complex States