Abstract
Measurements of the specific heat of amorphous AuxSn100-x films (27<or=x<or=74) between 0.35 K and 6 K in the superconducting as well as in the normal state are reported. In addition the temperature dependence of the upper critical field of these films is determined. In the superconducting state the specific heat shows a contribution proportional to the temperature which is strongly composition dependent and largest for x=74. In the author's opinion this contribution is caused by low-energy excitations well established in amorphous solids. Taking into account this contribution the specific heat in the normal state yields the electronic density of states at the Fermi energy in agreement with the data taken from critical field measurements. Using McMillan's formula the calculated bare density of states agrees with the free electron model over the whole concentration range. This result is surprising because recent Hall-effect and photoelectron-spectroscopy measurements indicate strong deviations from the free electron model, especially for samples with high Au concentrations.
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