THERMAL CONDUCTIVITY OF SUPERCONDUCTORS
ARMY ELECTRONICS COMMAND FORT MONMOUTH NJ
Pagination or Media Count:
The thermal conductivity of superconductors is discussed from the viewpoint of the two-fluid model and the Bardeen-Cooper-Schrieffer theory. The significance of the ratio of thermal conductivity superconductive state to thermal conductivity normal state is discussed and its dependence on the ratio of temperature to the transition temperature is shown to be a universal function independent of the particular element measured. The electronic thermal conductivity of superconductors with strong electron-phonon coupling differs markedly from typically weak superconductors like tin or indium. A theory is discussed to explain this phenomenon. The thermal conductivity in the superconductive state is discussed from the standpoint of a the ideal resistance, b the residual resistance, c the lattice component, and d in the intermediate state. The existence of gapless superconductivity is shown in the theory of the thermal conductivity of superconducting alloys with paramagnetic impurities. Finally, the use of thermal conductivity to detect defects in superconductors is discussed.
- Electricity and Magnetism