Fermi-Liquid Effects in Cyclotron-Phase-Resonance Transmission through Alkali Metals at 116 GHz

Cyclotron phase resonance (CPR) is observed at 116 GHz in sodium and potassium. The CPR signal shows effects due to electron correlations, including notches in the transmission amplitude, an asymmetry, and possibly a shift in resonance field from the Azbel-Kaner cyclotron-resonance (AKCR) value. A simple model describing these effects appears to indicate that CPR is a $k=0\mathrm{}$ resonance in the conductivity, i.e., a uniform resonance whose shift from AKCR should give the Fermi-liquid parameter $A_1$. Values found for $A_1$, however, disagree with previous estimates.