Electronic thermal conductivity of superconducting thin films of lead-indium alloy

The thermal conductivity of thin films of superconducting Pb-3 at. % In alloy is measured in the normal and the superconducting states. The ratio of the electronic thermal conductivity in the superconducting state K_es to that in the normal state K_en is found to be in good agreement with the Bardeen, Rickayzen and Tewordt theory with 2?_O = 4.36 kT_c.