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 $0.63m_0 \left(\alpha \mathrm{orbit}\right)$, $0.16m_0 \left(\beta \mathrm{orbit}\right)$, and $0.72m_0 \left(\tau \mathrm{orbit}\right)$ are identified. The effective mass of the $\gamma$ orbits is $0.69m_0$ 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 $\beta$ arms of the Fermi surface are reported.