Persistent insulator-to-metal transition of a VO2 thin film induced by soft X-ray irradiation

Persistent insulator-to-metal transition of a VO2 thin film induced by soft X-ray irradiation

We present a persistent soft-X-ray-induced insulator-to-metal transition at room temperature for VO2 thin films. Continuous soft X-ray irradiation renders the insulating electronic state metallic in the VO2 thin films, which has been found by photoemission spectroscopy measurement. The observed tran...

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Veröffentlicht in:Japanese Journal of Applied Physics 2014-04, Vol.53 (5S1)
Hauptverfasser: Muraoka, Yuji, Nagao, Hiroki, Katayama, Shinsuke, Wakita, Takanori, Hirai, Masaaki, Yokoya, Takayoshi, Kumigashira, Hiroshi, Oshima, Masaharu
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container_issue 5S1
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container_title Japanese Journal of Applied Physics
container_volume 53
creator Muraoka, Yuji
Nagao, Hiroki
Katayama, Shinsuke
Wakita, Takanori
Hirai, Masaaki
Yokoya, Takayoshi
Kumigashira, Hiroshi
Oshima, Masaharu
description We present a persistent soft-X-ray-induced insulator-to-metal transition at room temperature for VO2 thin films. Continuous soft X-ray irradiation renders the insulating electronic state metallic in the VO2 thin films, which has been found by photoemission spectroscopy measurement. The observed transition is irreversible and the metallic state persists when soft X-ray irradiation is stopped. The analysis of valence band spectra reveals that the density of states (DOS) of the V 3d band increases with irradiation time, while the DOS of the O 2p band decreases. We propose a simple model where the persistent insulator-to-metal transition is driven by oxygen desorption from VO2 thin films under soft X-ray irradiation. The present results will help in developing a new route for controlling the phase transition of VO2 by light.
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title Persistent insulator-to-metal transition of a VO2 thin film induced by soft X-ray irradiation
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