Magneto-resistance in metals

Experiments are reported in which novel results are found on the magneto-resistance of sodium and rubidium. Measurements have been made both on plate-like specimens which show very strong anisotropy in the magnetic field, and on a cylinder of diameter large comparedwitli the mean free path, ι, of the electrons. The anomalous behaviour appears certainly to depend on the attainment of large values of the ratio ι/r, where r is the orbital radius of a free electron in the magnetic field.