Abstract
The electronic structure and lattice vibration in the defective tin and amorphous tin-copper films vapour-deposited on cold substrates below 10 K were investigated by 119Sn Mössbauer effect. The copper-concentration dependence of the isomer shift and the recoilless fraction in the films corresponded well to that of the superconducting transition temperature, Tc. The metallic bonding in quenched tin-copper film increased with copper-concentration at 5 – 10 at% and decreased at 10 – 20 at%. The Debye parameter, θ D(−1), decreased with increasing copper concentration at 5 – 10 at% and recovered at 10 – 20 at%. The dependence of Tc on copper concentration was explained qualitatively by applying these changes in the electronic structure and the lattice vibration to the McMillan's equation.
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