Cyclotron Resonance in Aluminum

Abstract

Preliminary results of cyclotron resonance experiments at 35 kMc/sec in aluminum having a relatively long relaxation time at 4.2°K ($\omega \tau \sim 20$) are presented. Discrepancies and errors in earlier cyclotron resonance experiments are resolved. A tentative orbit identification scheme is proposed which indicates (a) that the second-zone Fermi surface is consistent with the single orthogonalized plane wave (OPW) model, and (b) that the third-zone Fermi surface is connected and that the connecting region is thicker than in the single OPW model. The effective masses obtained are compared with the values predicted by the single OPW model and with other experimental values, where pertinent. Departures of the effective mass value of orbits in the second zone from values given by the single OPW model are noted and may be attributable to electron-electron or electron-phonon effects.