Abstract
Kamerlingh Onnes and Sizoo have studied the effect of mechanical tension and hydrostatic pressure on the transition into the superconducting state using polycrystalline wires of Sn. Our studies constitute a quantitative continuation of their pioneer work and for this we used a single crystal of spectroscopic purity and we used a tension and compression force for elastic deformation. The results are compared with Gorter's two fluid electron model of superconductivity and show that the tension force increases the energy gap between the superconducting and normal state. This would seem to support the Fröhlich-Bardeen theory of lattice vibration interaction with the electrons to produce superconductivity.
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