Abstract
Measurements in the temperature range of 1.6 K to 6 K were carried out on fully stabilized niobium conductors. The calorimeter used for varying the temperature and the electrical measuring method for determining the 50 Hz losses are described. The results obtained agree well with theoretical derivations. The evaluation gives the temperature dependence of characteristic superconductor properties: the lower critical magnetic field strength H c 1 , the critical current density j c, the surface screening field ΔH, and enables certain facts to be stated on the nature of the niobium surface.
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