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

Yuji Muraoka, Hiroki Nagao, Shinsuke Katayama, Takanori Wakita, Masaaki Hirai, Takayoshi Yokoya, Hiroshi Kumigashira, Masaharu Oshima

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

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 VO 2 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.

Original languageEnglish
Article number05FB09
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume53
Issue number5 SPEC. ISSUE 1
DOIs
Publication statusPublished - 2014

Fingerprint

Transition metals
transition metals
insulators
Irradiation
X rays
Thin films
irradiation
thin films
x rays
Electronic states
Photoelectron spectroscopy
Valence bands
Desorption
photoelectric emission
Phase transitions
desorption
routes
valence
Oxygen
room temperature

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Persistent insulator-to-metal transition of a VO2 thin film induced by soft X-ray irradiation. / Muraoka, Yuji; Nagao, Hiroki; Katayama, Shinsuke; Wakita, Takanori; Hirai, Masaaki; Yokoya, Takayoshi; Kumigashira, Hiroshi; Oshima, Masaharu.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 53, No. 5 SPEC. ISSUE 1, 05FB09, 2014.

Research output: Contribution to journalArticle

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AU - Hirai, Masaaki

AU - Yokoya, Takayoshi

AU - Kumigashira, Hiroshi

AU - Oshima, Masaharu

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