2018
DOI: 10.1021/acsami.8b17879
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Vacancy-Driven Robust Metallicity of Structurally Pinned Monoclinic Epitaxial VO2 Thin Films

Abstract: Vanadium dioxide (VO2) is a strongly correlated material with 3d electrons, which exhibits temperature-driven insulator-to-metal transition with a concurrent change in the crystal symmetry. Interestingly, even modest changes in stoichiometry-induced orbital occupancy dramatically affect the electrical conductivity of the system. Here, we report a successful transformation of epitaxial monoclinic VO2 thin films from a conventionally insulating to permanently metallic behavior by manipulating the electron correl… Show more

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Cited by 32 publications
(24 citation statements)
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“…This situation is directly confirmed by the upward shift of O- K edge near the surface as indicated by the arrow in Fig. 1g 28 , suggesting that oxygen vacancies are introduced during delithiation, i.e., oxygen release. To estimate the local elemental concentrations, we evaluate the Li/Mn and O/Mn ratios by the integrated intensities of Li- K , Mn- M , O- K, and Mn- L edges, where the intensity integrations were performed through the yellow filled-regions in Fig.…”
Section: Resultsmentioning
confidence: 62%
“…This situation is directly confirmed by the upward shift of O- K edge near the surface as indicated by the arrow in Fig. 1g 28 , suggesting that oxygen vacancies are introduced during delithiation, i.e., oxygen release. To estimate the local elemental concentrations, we evaluate the Li/Mn and O/Mn ratios by the integrated intensities of Li- K , Mn- M , O- K, and Mn- L edges, where the intensity integrations were performed through the yellow filled-regions in Fig.…”
Section: Resultsmentioning
confidence: 62%
“…The observed evolution of the crystal lattice disorder suggests that the formation and relaxation of persistent switching can be explained by diffusion of defects, such as oxygen vacancies. Oxygen vacancies in VO 2 are capable of reducing the MIT temperature, [ 24,25 ] can migrate through the grain boundaries, and have a diffusion rate matching the observed time scales (see Figure 4b). Furthermore, the observed asymmetry, such as fast formation and slow relaxation, can be explained by trapping of vacancies inside the switched grains due to a reduced activation energy.…”
Section: Figurementioning
confidence: 68%
“…4). Although the Mn L-edge spectra of the two regions (i.e., Mn 2+ ) are in good agreement, a partial reduction of Ti 4+ to Ti 3+ occurred near the Mn−Ir−O layer 25,26 . Associated with this reduction, the presence of an oxygen deficiency is expected from the O K-edge spectra.…”
Section: Resultsmentioning
confidence: 87%