Temperature dependence of optical and transport properties in VO<inf>2</inf> with high temperature anomalies

Gentle, A; Maaroof, A; Smith, G

Temperature dependence of optical and transport properties in VO<inf>2</inf> with high temperature anomalies

Gentle, A

Maaroof, A Smith, G

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Publication Type:: Journal Article
Citation:: Current Applied Physics, 2008, 8 (3-4), pp. 229 - 232
Issue Date:: 2008-05-01

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Field	Value	Language
dc.contributor.author	Gentle, A https://orcid.org/0000-0001-8964-0722	en_US
dc.contributor.author	Maaroof, A	en_US
dc.contributor.author	Smith, G https://orcid.org/0000-0002-6985-2880	en_US
dc.date.issued	2008-05-01	en_US
dc.identifier.citation	Current Applied Physics, 2008, 8 (3-4), pp. 229 - 232	en_US
dc.identifier.issn	1567-1739	en_US
dc.identifier.uri	http://hdl.handle.net/10453/8333
dc.description.abstract	Thermochromic VO2 is of interest for energy efficient glazing, and for fast telecommunications because it optically switches in the near IR. Despite extensive study several aspects of its apparently diverse behaviour have not been explained satisfactorily. The visible-NIR permittivity and dc electrical conductivity of high quality thin films of VO2, across the metal-insulator phase transition and well into the metallic phase to temperatures up to 100 °C above Tc are studied as a function of temperature and grain size. Experimental behaviour is partly explained with effective medium models, existing band structures and classical transport theory. Anomalies however include: unphysically fast relaxation rate, counter-intuitive and significant differences between optical and dc, and bulk and thin film parameters; and residual "non-metallic" features above the transition in highly oriented films. Residual, but transient high temperature d-electron singlet pairing on V dimers, which is sensitive to nanostructure, is examined as a source of some anomalies. © 2007 Elsevier B.V. All rights reserved.	en_US
dc.relation.ispartof	Current Applied Physics	en_US
dc.relation.isbasedon	10.1016/j.cap.2007.10.006	en_US
dc.subject.classification	Applied Physics	en_US
dc.title	Temperature dependence of optical and transport properties in VO<inf>2</inf> with high temperature anomalies	en_US
dc.type	Journal Article
utslib.citation.volume	3-4	en_US
utslib.citation.volume	8	en_US
utslib.for	0205 Optical Physics	en_US
utslib.for	01 Mathematical Sciences	en_US
utslib.for	02 Physical Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	open_access
pubs.issue	3-4	en_US
pubs.publication-status	Published	en_US
pubs.volume	8	en_US

Abstract:

Thermochromic VO2 is of interest for energy efficient glazing, and for fast telecommunications because it optically switches in the near IR. Despite extensive study several aspects of its apparently diverse behaviour have not been explained satisfactorily. The visible-NIR permittivity and dc electrical conductivity of high quality thin films of VO2, across the metal-insulator phase transition and well into the metallic phase to temperatures up to 100 °C above Tc are studied as a function of temperature and grain size. Experimental behaviour is partly explained with effective medium models, existing band structures and classical transport theory. Anomalies however include: unphysically fast relaxation rate, counter-intuitive and significant differences between optical and dc, and bulk and thin film parameters; and residual "non-metallic" features above the transition in highly oriented films. Residual, but transient high temperature d-electron singlet pairing on V dimers, which is sensitive to nanostructure, is examined as a source of some anomalies. © 2007 Elsevier B.V. All rights reserved.

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http://hdl.handle.net/10453/8333