Cyclotron Resonance Measurements in Bismuth

Abstract

The derivative $\frac{\mathrm{dR}}{\mathrm{dH}}$ of the surface resistance $R(H)$ versus $H$ has been measured for $H$ parallel to the three principal crystallographic axes in bismuth. The experiments were performed at liquid-helium temperatures using circularly polarized radiation of wavelength 1.25 cm. The sample formed one end of a cylindrical resonant cavity, the static magnetic field being normal to the sample surface. The results obtained at fields higher than 300 G are in general agreement with those of Galt et al. Part of the structure present for fields less than 300 G is interpreted as an Azbel'-Kaner type resonance for electrons having a zero average velocity component parallel to the magnetic field. We have also seen the electron spin resonance and combined cyclotron resonance-spin flip transitions. The electron cyclotron effective masses determined are in good agreement with other experiments. The electron $g$ factors have been determined for the three crystallographic directions, and are consistent with the theoretical predictions of Blount and Cohen.