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Abstract:
The thermal conductivity of quenched condensed polycrystalline and
amorphous Pb and Pb 0.9Cu 0.1 films has been measured between 0.5 and
11K, i.e. in the superconducting ( Tlsim7K) and in the normal state (
Tgsim7K). Whereas, in agreement with previous results, phonon heat
transport is very small for crystalline films, a considerable portion of
heat is carried by phonons in amorphous films, owing to the absence of
extended lattice defects. Phonon scattering in these latter films is
analyzed in terms of scattering from conduction electrons above Tc,
whereas well below Tc, it is very likely due to low energy excitations
inherent in the amorphous structure.
