Abstract
Thermoelectric phenomena in superconductors have received much attention since 1927. Although the Seebeck effect, the Peltier effect and the Thompson heat are convincingly shown to be absent, the question whether this implies that the thermoelectric power S becomes zero in the superconducting state has not been definitely answered till now. In this paper a few experiments are reviewed in an attempt to come to a conclusion about the behaviour of the thermoelectric power in the superconducting state. An experiment is described in which the influence of a temperature difference on the current-voltage characteristic of a superconducting point contact is investigated. No effect has been measured both for niobium and lead devices, in spite of the high sensitivity reached. From the negative results it might be concluded that the thermoelectric power is strongly reduced in the superconducting state and is at least about a factor 10 smaller than the estimated value.
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