Open orbits on the Fermi surface of tin using the induced-torque method

Abstract

Both periodic and aperiodic open orbits have been studied at low fields, with most measurements at 10 kG. Aperiodic open orbits from both the fourth-zone hole surface and the fifth-zone electron surface have been clearly observed and the extent of the two-dimensional regions of magnetic field direction for these orbits has been plotted. The magnetic field dependence and temperature dependence of broad aperiodic open-orbit torque peaks have been used to predict the magnetic field and temperature dependence of two sharp periodic-open-orbit torque peaks and thus to demonstrate that those sharp peaks are caused by periodic open orbits which exist on both the fourth- and fifth-zone surfaces simultaneously. A large number of periodic open orbits which exist along directions of lower symmetry for smaller ranges of magnetic field direction have been observed, many for the first time. The data are compard with the results of other experiments and with theoretical predictions.