Evolution of Metallicity in Vanadium Dioxide by Creation of Oxygen Vacancies
Zhang Z, Zuo F, Wan C, Dutta A, Kim J, Rensberg J, Nawrodt R, Park HH, Larrabee TJ, Guan X, Zhou Y, Prokes SM, Ronning C, Shalaev VM, Boltasseva A, Kats MA, Ramanathan S (2017)
Publication Type: Journal article
Publication year: 2017
Journal
Book Volume: 7
Article Number: 034008
Journal Issue: 3
DOI: 10.1103/PhysRevApplied.7.034008
Abstract
Tuning of the electronic state of correlated materials is key to their eventual use in advanced electronics and photonics. The prototypical correlated oxide (VO2) is insulating at room temperature and transforms to a metallic state when heated to 67 °C (340 K). We report the emergence of a metallic state that is preserved down to 1.8 K by annealing thin films of VO2 at an ultralow oxygen partial pressure (PO2∼10-24 atm). The films can be reverted back to their original state by annealing in oxygen, and this process can be iterated multiple times. The metallic phase created by oxygen deficiency has a tetragonal rutile structure and contains a large number of oxygen vacancies far beyond the solubility at equilibrium (greater than approximately 50 times). The oxygen starvation reduces the oxidation state of vanadium from V4+ to V3+ and leads to the metallization. The extent of resistance reduction (concurrent with tuning of optical properties) can be controlled by the time-temperature envelope of the annealing conditions since the process is diffusionally driven. This experimental platform, which can extensively tune oxygen vacancies in correlated oxides, provides an approach to study emergent phases and defect-mediated adaptive electronic and structural phase boundary crossovers.
Involved external institutions
Purdue-University
United States (USA) (US)
University of Wisconsin - Madison
United States (USA) (US)
Friedrich-Schiller-Universität Jena
Germany (DE)
U.S. Naval Research Laboratory
United States (USA) (US)
Harvard University
United States (USA) (US)
United States (USA) (US)
University of Wisconsin - Madison
United States (USA) (US)
Friedrich-Schiller-Universität Jena
Germany (DE)
U.S. Naval Research Laboratory
United States (USA) (US)
Harvard University
United States (USA) (US)
How to cite
APA:
Zhang, Z., Zuo, F., Wan, C., Dutta, A., Kim, J., Rensberg, J.,... Ramanathan, S. (2017). Evolution of Metallicity in Vanadium Dioxide by Creation of Oxygen Vacancies. Physical Review Applied, 7(3). https://doi.org/10.1103/PhysRevApplied.7.034008
MLA:
Zhang, Zhen, et al. "Evolution of Metallicity in Vanadium Dioxide by Creation of Oxygen Vacancies." Physical Review Applied 7.3 (2017).
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