Electrical Resistivity of Potassium from 1 to 25 °K

Low-temperature electrical-resisitivity data are presented for pure and impure potassium samples [$8000\gtrsim \frac{\rho (20\mathrm{} °\mathrm{C}}{\rho \left(0\mathrm{} °\mathrm{K}\right)\gtrsim 100}$] and compared with theory. The experimental and theoretical results are tabulated, interpreted, and compared with the work of others. In particular, the resistivity data of the impure samples exhibited only relatively minor deviations from Matthiessen's rule and did not differ appreciably in temperature dependence from the resistivity data of the pure samples. Experimental details are presented and a short study of quenching effects has been made.