1970 年 39 巻 2 号 p. 102-113
Expression of the electrical resistivity of the magnetic dilute alloy is derived by the method used by Kondo when he found the well-known logarithmic singularity. The expression could give reasonable explanation to the experimental results for copper-manganese system with manganese concentration from 0.06 to 5.2 atomic percent in the temperature range between 2K and 300K. In higher concentration above one atomic percent, the resistivity shows a considerable contribution from the logarithmic term in higher temperature range, and the coefficient of the term agrees well with that of the low concentration alloy. On the basis of the above results, the peculiar temperature dependence of Manganin, the standard resistance material, which has 12 percent manganese in copper, could be explained substantially, and very low temperature coefficient of the resistivity near room temperature would be expected from the strong influence of the logarithmic term by Kondo.