Negative Magnetoresistance in the Metallic Impurity Conduction of n-Type Germanium

抄録

The magnetoresistance effect in n-type germanium containing more than 2.10¹⁷ cm⁻³ antimony atoms has been measured at liquid helium temperature. These samples show a metallic impurity conduction and the resistivity decreases a few per cent when a magnetic field of 3 to 10 kφ is applied. The magnitude of the low field magnetoresistance coefficient is larger for samples containing higher concentration of donors, and becomes larger when the temperature is lowered. A phenomenological consideration is carried assuming that this negative magnetoresistance is due to the localized magnetic moments formed among the impurity electrons.