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Title: A near-field study of VO2/(100)TiO2 film and its crack-induced strain relief

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/5.0099142· OSTI ID:1875941

Temperature-induced metal–insulator transition (MIT) in vanadium dioxide (VO2) has been under intense research interest for decades both theoretically and experimentally. Due to the complex nature of electron correlations, the underlying physics behind the MIT in VO2 has yet to be fully grasped. In this work, we utilize the fine resolution of the scattering-type scanning near-field optical microscope to investigate the MIT in an epitaxial VO2 thin film on the (100)R TiO2 substrate with mid-infrared light. Bidirectional tweed-like metal–insulator phase coexistence patterns are observed and understood under the Landau free energy paradigm. More interestingly, delayed metallic nucleation is observed near the surface cracks due to local strain relief. This research proposes ideas in investigating the temperature–pressure phase diagram and tuning the interplay between local strain and MIT in oxide thin films.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0012704
OSTI ID:
1875941
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Vol. 121 Journal Issue: 2; ISSN 0003-6951
Publisher:
American Institute of PhysicsCopyright Statement
Country of Publication:
United States
Language:
English

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