Electron Energy-loss Spectroscopy Study of the Metal-insulator Transition in VO 2
- 1 January 1997
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 36 (1R)
- https://doi.org/10.1143/jjap.36.165
Abstract
Electron energy-loss spectra of VO2 have been measured from perfect single crystalline areas of 100–180 nm diameter in the metallic and insulating phases. A sharp peak has been observed at 1.2 eV in the valence electron excitation spectra of the metallic phase but not in those of the insulating phase. We assign the peak to an interband transition or d-d transition by inspecting the dielectric function derived from the present loss function with the help of an energy band diagram already given, although an excitation at about 1 eV already observed by optical measurement was assigned to the excitation of a free-carrier plasmon. The peak due to the O 1s → V 3d(t 2g ) transition in the O 1s excitation spectra decreased in intensity but increased in the full width at half-maximum (FWHM) at the transition from the metallic phase to the insulating phase. These changes are considered to have been due to the fact that the d \varparallel band splits into the upper unoccupied and lower occupied d \varparallel bands and the upper d \varparallel band rises above the π* band in the insulating phase, but that the d \varparallel band is unsplit and located within the π* band in the metallic phase.Keywords
This publication has 27 references indexed in Scilit:
- Electron-Energy-Loss Spectroscopy of Oxide Superconductor Bi2Sr 2CaCu 2O 8Japanese Journal of Applied Physics, 1995
- Performance of a new high-resolution electron energy-loss spectroscopy microscopeMicroscopy Microanalysis Microstructures, 1991
- 2pabsorption spectra of the3delementsPhysical Review B, 1985
- Study of the semiconductor-to-metal transition in VO2 and V2O3 by ultraviolet photoelectron spectroscopyJournal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics, 1980
- Differential reflectance spectra and band structure ofPhysical Review B, 1976
- Metal-insulator transition in vanadium dioxidePhysical Review B, 1975
- The metal-non-metal transition in VO2: X-ray photoemission and resistivity measurementsJournal of Physics C: Solid State Physics, 1975
- Energy Bands of Semiconducting VPhysical Review B, 1973
- Energy Bands of Metallic VPhysical Review B, 1973
- Photoemission from VPhysical Review B, 1969