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

Abstract

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 $T{\mathrm{e}}^{\ensuremath{-}\frac{\ensuremath{\theta}}{T}}$, with $\ensuremath{\theta}=19.9\ifmmode\pm\else\textpm\fi{}0.2$ K, which is due to electron-phonon scattering under phonon-drag conditions. At temperatures below 2 K a weak dependence of the form $A{T}^{s}$ is dominant, where $s$ is between 1 and 2. Tentatively one could ascribe this term to electron-electron scattering.