Cyclotron Resonance on Improved Specimens of Zinc

Azbel'-Kaner cyclotron resonance has been studied at 35 Gc/sec and at temperature between 1.4 and 4.2°K in the three principal crystal planes of zinc. Fifteen distinct mass series were observed and their mass values determined as a function of the orientation of the magnetic field in the sample surface. The mass values of eight series are in general agreement with earlier work of Shaw, Sampath, and Eck, and of Henningsen. The angular range of observability of the limiting point resonance of the electrons on the spherical caps of the lens has been extended. In addition, seven new mass series have been observed in zinc for the first time and are assigned to orbits on the Fermi surface. Two of these mass series are in excellent agreement with the mass values given by the de Haas-van Alphen experiments of Joseph and Gordon. Magnetic breakdown between the first- and second-band hole surfaces has been observed, and an estimate of the energy gap between these bands near the point $H$ in the Brillouin zone is given. A new technique for growing zinc samples in the desired orientation with optically flat unstrained surfaces was developed.