De Haas-van Alphen Effect in Bismuth-Tellurium Alloys

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Abstract
De Haas-van Alphen measurements have been made on pure bismuth and several bismuth-tellurium alloys. It is found that the observed variation of external cross section and cyclotron effective mass with tellurium concentration and magnetic field orientation can be interpreted using a special case of Cohen's nonellipsoidal model of bismuth. The results indicate that there is a thermal energy gap between the conduction and valence band of about 0.046 ev in agreement with various optical experiments and that there are six electron "ellipsoids." The results also agree with a model for the hole band involving one light-hole ellipsoid and one heavy-hole ellipsoid and are used as evidence against some other possible models for the hole band.

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