Temperature dependence of the optical phonons and transverse effective charge in 3C-SiC
Abstract
The temperature dependence of the long-wavelength optical phonons of 3C-type SiC has been measured for temperatures up to 750 K. The LO-TO splitting diminishes with increasing temperature. From these data a weak decrease of the transverse effective charge with increasing temperature is also derived. The "explicit" temperature contribution to the variation of the transverse effective charge is determined experimentally and calculated in terms of a pseudopotential expression for the charge. Good agreement between theory and experiment is achieved.
- Publication:
-
Physical Review B
- Pub Date:
- March 1982
- DOI:
- 10.1103/PhysRevB.25.3889
- Bibcode:
- 1982PhRvB..25.3889O