Galvanomagnetic Effects inn-Type Indium Antimonide

Abstract

The magnetic field dependence of the magnetoresistive effects and the Hall coefficient have been investigated at 78°K and at liquid helium temperatures. Results at very low magnetic field strength are in agreement with the assumption of an isotropic conduction band. Quantization of the electron orbits causes deviations from the conventional theory at large fields (of the order of a few thousand gauss and higher). Oscillations in the magnetoresistance observed at 4.2°K and lower are attributed to these quantum effects. The measured period of oscillation agrees reasonably well with theoretical predictions. An effective mass value of 0.01 $m_0$ is obtained from the field and temperature dependence of the amplitude of the oscillations. The magnitude of the magnetoresistive effects appears to depend considerably on the geometry and inhomogeneity of the sample. Strong magnetic fields also influence the distribution of "free" and bound electrons, causing a freeze-out effect at temperatures of liquid helium.