The temperature dependent part of the impurity resistivity in aluminium alloys with germanium

Abstract

Values of the electrical resistivity of polycrystalline Al-Ge alloys with different solute concentrations have been measured from 4.2-320K. It is found experimentally that the phonon resistivity of the alloys in the temperature region 10-60K varies as T2<n<3.6. At intermediate temperatures the deviation from Matthiessen's rule passes through a maximum which shifts to higher temperatures with concentrations as c15/. At high enough temperatures the sign of the derivative delta Delta (T)/ delta T is negative. The results obtained experimentally are compared with theory.