Date of Award
Doctor of Philosophy
Physics and Astronomy
Heat capacities have been measured in the presence of magnetic fields for Cu-Nb and Cu-Nb(,3)Sn in situ composites in order to determine the size of the superconducting pair potential which is induced in the normal Cu region as a function of magnetic field. For the Cu-Nb composites the induced pair potential is found to be about 0.35 meV in zero field, in agreement with de Gennes boundary conditions. With the application of a magnetic field, the energy gap declines quickly and above about 17 mT the Cu behaves as a gapless superconductor. A family of life-time broadened density of states which gives the measured C(,es)(Cu) is calculated based on the relation between the entropy S and density of states N((omega)) derived for superconductors doped with paramagnetic impurities. Similar results are found in Cu-Nb(,3)Sn composites.
Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/
Shelly Sit-Ling Shum Eucker
Eucker, Shelly Sit-Ling Shum, "Proximity effect in Cu-Nb-Sn composites " (1981). Retrospective Theses and Dissertations. 6902.