Abstract
Measurements have been made of the derivative of the microwave surface absorption of -type and -type PbSe as a function of static magnetic field H at 70 GHz and 4.2°K. H was parallel to the sample surface (Azbel-Kaner geometry) which was a (100) plane that formed the central section of the bottom wall of a cylindrical cavity resonant in the T mode. The microwave electric field E was set both parallel and perpendicular to H. Experimental curves obtained with H aligned along the [001] axis and the [011] axis, with the ordinary mode (E∥H) and the extraordinary mode () of propagation excited independently, show good agreement with curves calculated for a high-density plasma under classical skin-effect conditions, with the assumption of an ellipsoid of revolution model for both the valence- and conduction-band extrema, and an appropriate isotropic relaxation time. The main structure in the curves is attributable to either hybrid or tilted-orbit resonances and to dielectric anomalies, but not to Azbel-Kaner resonance. The values deduced for the transverse effective mass and for the anistropy, , for the -type specimen which had a carrier concentration of 1.1 × , were and , and for the -type specimen ( ) were and . Weak structure was also observed at low magnetic fields, which may be due to nonlocal effects such as subharmonic Azbel-Kaner resonance.
- Received 19 January 1967
DOI:https://doi.org/10.1103/PhysRev.158.723
©1967 American Physical Society