RESISTANCE MINIMUM AND RESISTIVITY OF COPPER AT LOW TEMPERATURES

The role of the annealing atmosphere on the electrical resistivity minimum of copper was studied. The experimental techniques for these measurements are briefly described. The samples consisted of 0.05-cm diameter copper wire of 25-cm length wound around a quartz tube. The specimens were annealed in an evacuated mullite tube which allowed for annealing in desired atmospheres by means of a controlled leak. A temperature range from 1.7 to 25.0 deg K was covered. (W.D.M.)