Date of Award

2-1976

Degree Type

Thesis

Degree Name

Doctor of Philosophy (PhD)

Department

Physics

Supervisor

Dr. W. R. Datars

Abstract

The dHvA frequencies, cyclotron masses, and Dingle temperatures of antimony-tellurium alloys with up to 0.11 at.% Te were measured using the low frequency field modulation technique. The hole and electron frequencies decreased and increased respectively, as predicted by the rigid band model. At the highest concentration, the increase is about 25% that of pure Sb and the decrease is about 20%. The cyclotron masses of electrons and holes changed with concentration. This dependence resulted from the nonparabolicity of the Sb bands. Estimates of the Fermi surface volume of the alloys indicated that each Te atom contributes one electron to the alloy. The present results are compared with previous dHvA results on antimony-tin alloys.

Antimony g-factors of holes and electrons were also determined by the dHvA effect using the torque and field modulation methods. Possible g-factors were deduced from the harmonic content in the oscillation waveform following the method described by Randles. A measurement of the g-factors at certain field directions was also obtained from spin-splitting of the oscillations observed at high magnetic fields. The excellent agreement between the results of these methods suggests the validity of the Lifshitz-Kosevich equation for antimony and the absence of non-linear effects. The choice of g-factors for electrons from the several possibilities allowed by the data analysis was determined through a theoretical calculation in the effective mass approximation. These values are consistent with spin resonance and infinite field phase measurements. The choice of hole g-factors was made from a comparison with spin resonance data. The g-factors at the binary, bisectrix and trigonal directions are ~15, 16.8, 3.5 and 4.5, 18.0, 14.5 for the principal branches of electrons and holes, respectively.

Included in

Physics Commons

Share

COinS