title: Probing the photothermally induced phase transitions in single-crystalline vanadium dioxide nanobeams.
abstract: Using Raman spectroscopy, we demonstrated photothermally induced crystallographic phase transitions of vanadium dioxide (VO2) nanobeams clamped to and free-standing on a substrate. Compared to the temperature-dependent Raman measurements, the laser-power-dependent Raman characteristics provide substantial evidence for the photothermal origin of the phase transitions of the VO2 nanobeams. The laser power necessary to cause phase transitions in the free-standing nanobeam was approximately eight times smaller than the laser power used in the substrate-clamped nanobeam. Our study will enhance the understanding of the complex phase transitions of strongly correlated oxides and thereby provide a foundation for engineering desirable properties in novel devices.
authors.affiliation: Division of Materials Science, Korea Basic Science Institute, Daejeon 305-333, Korea.
authors.forename: Sung-Jin
authors.initials: SJ
authors.lastname: Chang
authors.forename: Woong-Ki
authors.initials: WK
authors.lastname: Hong
authors.forename: Hae Jin
authors.initials: HJ
authors.lastname: Kim
authors.forename: Jin Bae
authors.initials: JB
authors.lastname: Lee
authors.forename: Jongwon
authors.initials: J
authors.lastname: Yoon
authors.forename: Heung Cho
authors.initials: HC
authors.lastname: Ko
authors.forename: Yun Suk
authors.initials: YS
authors.lastname: Huh