Abstract
Investigations of the electrical properties of metallic point contacts with low resistances show that the temperature in the point contact area is directly proportional to the bias voltage in the temperature range between 4.2K and 50K. The obtained overheating of the point contact area caused by non-equilibrium phonons is independent of the temperature but depends on the point contact resistance. It will be shown, that it is possible to use the Wiedemann-Franz law for description of the electrical behaviour of the point contacts at low temperatures.
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