Temperature dependence of thermal conductivity of VO2 thin films across metal-insulator transition

Hinako Kizuka, Takashi Yagi, Junjun Jia, Yuichiro Yamashita, Shinichi Nakamura, Naoyuki Taketoshi, Yuzo Shigesato

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Thermal conductivity of a 300-nm-thick VO2thin film and its temperature dependence across the metal-insulator phase transition (TMIT) were studied using a pulsed light heating thermoreflectance technique. The VO2and Mo/VO2/Mo films with a VO2thickness of 300 nm were prepared on quartz glass substrates: the former was used for the characterization of electrical properties, and the latter was used for the thermal conductivity measurement. The VO2films were deposited by reactive rf magnetron sputtering using a V2O3target and an Ar-O2mixture gas at 645K. The VO2films consisted of single phase VO2as confirmed by X-ray diffraction and electron beam diffraction. With increased temperature, the electrical resistivity of the VO2film decreased abruptly from 6.3 × 10-1to 5.3 × 10-4Ωcm across the TMITof around 325-340K. The thermal conductivity of the VO2film increased from 3.6 to 5.4W m-1K-1across the TMIT. This discontinuity and temperature dependence of thermal conductivity can be explained by the phonon heat conduction and the Wiedemann-Franz law.

Original languageEnglish
Article numbere053201
JournalJapanese journal of applied physics
Volume54
Issue number5
DOIs
Publication statusPublished - 2015 Jan 1
Externally publishedYes

ASJC Scopus subject areas

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

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