Magnetoresistance Study of Open Orbits in Gallium

The results of an extensive investigation of the magnetoresistive properties of gallium are presented. It is found that the Fermi surface of gallium is topologically open in the ${\overrightarrow{\mathrm{k}}}_x$ and ${\overrightarrow{\mathrm{k}}}_z$ directions. At least five different open-orbit regions are found; of these, several apparently result from the effects of magnetic breakdown. The consistency of the data with recent pseudopotential calculations is discussed.