Sliding twin-domains in self-heated needle-like VO2 single crystals
Autor: | George M. Reisner, Bertina Fisher, Larisa Patlagan |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
010302 applied physics
Multidisciplinary Materials science Condensed matter physics lcsh:R lcsh:Medicine 02 engineering and technology 021001 nanoscience & nanotechnology Polarization (waves) 01 natural sciences Symmetry (physics) Tetragonal crystal system Reflection (mathematics) Phase (matter) 0103 physical sciences Condensed Matter::Strongly Correlated Electrons lcsh:Q Electric current 0210 nano-technology lcsh:Science Single crystal Monoclinic crystal system |
Zdroj: | Scientific Reports, Vol 10, Iss 1, Pp 1-7 (2020) |
ISSN: | 2045-2322 |
Popis: | The prototypical metal-insulator transition in VO2 at 340 K is from a high-temperature rutile phase to a low-temperature monoclinic phase. The lower symmetry of the monoclinic structure removes the degeneracy of the two equivalent directions of the tetragonal structure, giving rise to twin domains. Since formation of domain walls require energy most needle-like monoclinic single crystal are single-domain. The mixed metal-insulator state in self-heated needle-like single crystals exhibits various domain patterns, the most remarkable being static insulating triangular domains embedded in the metal and narrow insulating domains sliding along the metallic background in the direction of the electric current. Reported here are results obtained for some rare needle-like twinned VO2 single crystals. Such sample revealed a unique feature: joint static triangular twins emit sliding twin domains, first overlapping and later disjoining. Dark and bright twins and dim metallic background were seen for optimal orientation under a microscope, due to polarization by reflection. |
Databáze: | OpenAIRE |
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