High Field Induced Torques and the Fermi Surface of Osmium

Abstract

The Fermi surface of osmium has been investigated using the induced torque technique at high magnetic fields. This is believed to be the first report of an induced torque experiment performed on a low conductivity sample and in the high fields of a superconducting magnet. Open orbits were found for B along [Formula: see text]. These orbits continue to be seen as the magnetic field is tilted to at least 65° from the basal plane. The dependence of the open orbit torque on magnetic field strength, rotation rate, and tilt angle was studied. No open orbits were found for B along [Formula: see text]. Torques due to closed orbits were also studied, and comparison of the predictions of the free electron model is given for these torques. A maximum in the torque is seen for B along [0001], and an explanation is suggested for this behavior.