The hall coefficient of Al-Ga alloys

The Hall coefficientR_H of aluminium-base gallium solid solution alloys have been measured as a function of concentration and magnetic field at 4.2 K. The low field Hall coefficientR₀ at first increases rapidly and is always positive. But as soon as the electron scattering is predominantly governed by the induced Ga impurities, the Hall coefficientR₀ remains constant and the Kohler rule is fulfilled, because then only the concentration of the identical Ga atoms is enlarged. The positive values ofR₀ show that the anisotropic scattering of the electrons on the Ga atoms is the cause of this effect.