Covalent insulator: Optical reflectivity measurements
- 15 July 1987
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 36 (2) , 1238-1243
- https://doi.org/10.1103/physrevb.36.1238
Abstract
The optical reflectivity of single crystals has been measured from 1 meV to 12 eV at 300 K and then analyzed in terms of a Kramers-Kronig transformation. Static and optic dielectric constants, TO- and LO-phonon frequencies, the effective charge, and the degree of covalency have been obtained. It can be asserted that is not of intermediate valence but it is a covalent insulator.
Keywords
This publication has 21 references indexed in Scilit:
- On the valence states of cerium in CeO2Solid State Communications, 1985
- Valence fluctuations in narrow band oxidesJournal of Magnetism and Magnetic Materials, 1985
- Comment on "Spectroscopic Evidence for Localized and Extended-Symmetry States in Ce"Physical Review Letters, 1984
- Spectroscopic Evidence for Localized and Extended-Symmetry States in CePhysical Review Letters, 1984
- Electron spectroscopies for Ce compounds in the impurity modelPhysical Review B, 1983
- Mixed-valent ground state of CePhysical Review B, 1983
- - and core-level photoemission satellites in cerium compoundsPhysical Review B, 1983
- Final-state effects in the photoelectron spectrum of and comparison withPhysical Review B, 1976
- Optical and electrical properties of the mixed valence compound Sm3S4Solid State Communications, 1976
- Electronic structure of a mixed valence system:Physical Review B, 1975