Influence of the Proximity Effect on the Electron Thermal Conductivity of Superconducting Thin-Film Sandwiches of Indium and Thallium

Publisher Website
Google Scholar
Abstract
We have produced a proximity-effect sample by evaporating a layer of thallium and then a layer of indium onto an insulating substrate cooled to 3.5 K. We have measured the thermal conductivity, electrical resistivity, transition temperature, and thickness of the sandwich sample and each of its components for various thicknesses of indium and thallium. The thermal-conductivity results are compared with an effective-gap-parameter model. The agreement is good, but a more rigorous theoretical treatment should be made.