Suppression of Metal-Insulator Transition in VO2 by Electric Field—Induced Oxygen Vacancy Formation.

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Bibliographic Details
Title:	Suppression of Metal-Insulator Transition in VO2 by Electric Field—Induced Oxygen Vacancy Formation.
Authors:	Jaewoo Jeong, Aetukun, Nagaphani, Graf, Tanja, Schladt, Thomas D., Samant, Mahesh G., Parkin, Stuart S. P.
Source:	Science (pre-March 2025). 3/22/2013, Vol. 339 Issue 6126, p1402-1405. 4p.
Subjects:	Metal-insulator transitions, Electrolytes, Vanadium oxide, Phase transitions, Transition temperature, Ionic liquids, Vacancy-dislocation interactions, Electrostatics
Abstract:	Electrolyte gating with ionic liquids is a powerful tool for inducing novel conducting phases in correlated insulators. An archetypal correlated material is vanadium dioxide (VO2), which is insulating only at temperatures below a characteristic phase transition temperature. We show that electrolyte gating of epitaxial thin films of VO2 suppresses the metal-to-insulator transition and stabilizes the metallic phase to temperatures below 5 kelvin, even after the ionic liquid is completely removed. We found that electrolyte gating of VO2 leads not to electrostatically induced carriers but instead to the electric field-induced creation of oxygen vacancies, with consequent migration of oxygen from the oxide film into the ionic liquid. This mechanism should be taken into account in the interpretation of ionic liquid gating experiments. [ABSTRACT FROM AUTHOR]
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Database:	Psychology and Behavioral Sciences Collection

Description
Abstract:	Electrolyte gating with ionic liquids is a powerful tool for inducing novel conducting phases in correlated insulators. An archetypal correlated material is vanadium dioxide (VO2), which is insulating only at temperatures below a characteristic phase transition temperature. We show that electrolyte gating of epitaxial thin films of VO2 suppresses the metal-to-insulator transition and stabilizes the metallic phase to temperatures below 5 kelvin, even after the ionic liquid is completely removed. We found that electrolyte gating of VO2 leads not to electrostatically induced carriers but instead to the electric field-induced creation of oxygen vacancies, with consequent migration of oxygen from the oxide film into the ionic liquid. This mechanism should be taken into account in the interpretation of ionic liquid gating experiments. [ABSTRACT FROM AUTHOR]
ISSN:	00368075
DOI:	10.1126/science.1230512