Temperature-Dependent Raman and Ultraviolet Photoelectron Spectroscopy Studies on Phase Transition Behavior of VO2 Films with M1 and M2 Phases - Université de Tours Accéder directement au contenu
Article Dans Une Revue Journal of Applied Physics Année : 2014

Temperature-Dependent Raman and Ultraviolet Photoelectron Spectroscopy Studies on Phase Transition Behavior of VO2 Films with M1 and M2 Phases

Kunio Okimura
Nurul Hanis Azhan
  • Fonction : Auteur
Tetsuya Hajiri
  • Fonction : Auteur
Shin-Ichi Kimura
  • Fonction : Auteur

Résumé

Structural and electronic phase transitions behavior of two polycrystalline VO2 films, one with pure M1 phase and the other with pure M2 phase at room temperature, were investigated by temperature-controlled Raman spectroscopy and ultraviolet photoelectron spectroscopy (UPS). We observed characteristic transient dynamics in which the Raman modes at 195 cm−1 (V-V vibration) and 616 cm−1 (V-O vibration) showed remarkable hardening along the temperature in M1 phase film, indicating the rearrangements of V-V pairs and VO6 octahedra. It was also shown that the M1 Raman mode frequency approached those of invariant M2 peaks before entering rutile phase. In UPS spectra with high energy resolution of 0.03 eV for the M2 phase film, narrower V3d band was observed together with smaller gap compared to those of M1 phase film, supporting the nature of Mott insulator of M2 phase even in the polycrystalline film. Cooperative behavior of lattice rearrangements and electronic phase transition was suggested for M1 phase film.
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Dates et versions

hal-01831023 , version 1 (05-07-2018)

Identifiants

Citer

Kunio Okimura, Nurul Hanis Azhan, Tetsuya Hajiri, Shin-Ichi Kimura, Mustapha Zaghrioui, et al.. Temperature-Dependent Raman and Ultraviolet Photoelectron Spectroscopy Studies on Phase Transition Behavior of VO2 Films with M1 and M2 Phases. Journal of Applied Physics, 2014, 115 (15), pp.153501. ⟨10.1063/1.4870868⟩. ⟨hal-01831023⟩
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