Abstract
Low-field galvanomagnetic coefficients have been measured on single crystals of and at 76 °K in fields to 9 kG. Using a six-valley ellipsoid model in the isotropic relaxation-time approximation, the mass parameters of the ellipsoids are calculated for both compounds. The discrepancy between previously reported galvanomagnetic data and de Haas-van Alphen data for can be minimized by recalculating the mass parameters from the galvanomagnetic data and by not assuming complete degeneracy. The experimental data on are in agreement with those reported earlier. There is also very good evidence of second-band effects at high electron concentrations (> ), as has been previously suggested. The constant-energy surfaces undergo an apparent change in shape between low- and high-concentration samples. Data on indicate that the constant-energy surfaces are more spherical than in the case of .
- Received 17 November 1969
DOI:https://doi.org/10.1103/PhysRevB.2.3209
©1970 American Physical Society