Harmonic oscillations in the surface impedance of thin metallic slabs

Abstract

Oscillations below the helicon edge, with harmonic structure that might be due to the four fold symmetry of the Fermi surface, have been reported in the literature for both In and Al. These oscillations are discussed in terms of Gantmakher-Kaner oscillations, of Doppler shifted cyclotron resonance modes and of a minimum in delta A/ delta kz. The difficulty of interpreting these oscillations is emphasized.