Tin Single Crystals Research Articles

The electrical resistance of potassium, tungsten, copper, tin and lead at low temperatures

Measurements of the electrical resistance of potassium wires in glass tubes, of single crystals of tungsten, of technical copper wires, of single crystals of tin and lead wires were made at low temperatures. Matthiessen's rule was found valid for the technical copper wires contrary to other measurements 1), 2). The “ideal” resistance of potassium wires and of tin single crystals follows the formula of Bloch 4) below about 10°K. The single crystals of tungsten have an “ideal” resistance, which is a linear function of T 3.6. The extrapolation of the resistance-temperature curve of lead by means of measurements in a magnetic field, which disturb the super-conductivity is not very reliable. A comparison of the calculated “ideal” resistance according to the formula of Grüneisen (1930) 5) with the “ideal” resistance, calculated from the measurements between 7 and 90°K, shows large deviations above 20°K. The characteristic temperature, calculated from the measurements above 20°K, is very different from that from the specific heat.

Investigations of lattice defects by means of x-rays: IV. The diffuse pattern of tin single crystals

Summary The diffuse streaks, appearing on a Laue photograph of tin, which have been previously discussed, are now considered in the light of the thermal theory of diffuse spots. The calculation, starting from the elastic constants of tin, shows a rather good agreement with the observed diffuse streaks. A small discrepancy may indicate that the assumed value for at least one of the constants is wrong.