Low-Temperature Limit of the Temperature-Dependent Part of the Resistivity of Potassium

The electrical resistivity of potassium has been measured with high accuracy between 4.2 and 1.1 K. At temperatures above 2 K the dominant term is of the form Te^-θT, with θ=19.9±0.2 K, which is due to electron-phonon scattering under phonon-drag conditions. At temperatures below 2 K a weak dependence of the form ATˢ is dominant, where s is between 1 and 2. Tentatively one could ascribe this term to electron-electron scattering.