CALORIMETRIC MEASUREMENT OF NEGATIVE SURFACE ENERGY IN SUPERCONDUCTORS OF THE SECOND KIND.
Final rept. 1 Sep 65-31 Dec 68,
MISSOURI UNIV ROLLA
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The experimental details of this study are covered in the Ph.D. Thesis of Robert R. Riche entitled A Calorimetric Study of the Effects of Surface Energy in a type II Superconductor. The entropy of the mixed state of type II superconductors has been investigated experimentally. The results have been interpreted in terms of the interaction of quantized fluxoids near H sub c1 or solutions of the Ginsburg-Landau equations near H sub c2 instead of the negative surface energy model of the original proposal. One of the experimental methods used was a direct calorimetric measurement of the head added to hold the sample at a constant temperature as the magnetic induction was increased. An accurate technique for determining the thermodynamic critical field for an irreversible sample was also a contribution of this work. Author
- Electricity and Magnetism