Transmission and reflection generalized variable-angle spectroscopic ellipsometry and polarized transmission intensity measurements over the photon energy range from 0.74 to 5.0 eV have been used to characterize the optical properties of the ordered-vacancy compound (Formula presented) We report the dispersion of the uniaxial refractive index below the band gap. The onset of weak absorption indicates the fundamental band edge at about 2.95 eV, but does not reveal the nature of the lowest band-to-band transition. Above the fundamental band gap we assign four possible critical-point structures from a line-shape analysis of the sample dielectric function.
|Original language||English (US)|
|Number of pages||6|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 1998|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics