Azbel'-Kaner Cycoltron Resonance in Mercury

Azbel'-Kaner cyclotron resonance in single-crystal mercury was studied at 1.2^∘{}K with frequencies of 35 and 70 GHz, using the slightly curved free surface of the mercury crystals as the sample surface. Cyclotron effective-mass results from four samples with different crystal orientations are reported and interpreted using Keeton and Louck's relativistic augmented-plane-wave model of the Fermi surface. Cycloton resonance from three orbits with minimum-mass values 0.63m₀ (α orbit), 0.16m₀ (β orbit), and 0.72m₀ (τ orbit) are identified. The effective mass of the γ orbits is 0.69m₀ with the magnetic field along the binary direction. The ratio of the measured cyclotron-mass values to that predicted by the single-orthogonalized-plane-wave approximation is 1.75±{}0.1. Quantum oscillations of the microwave surface impedance from orbits on the β arms of the Fermi surface are reported.