Superconductivity of quench-condensed beryllium and beryllium-germanium films |
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Authors: | A Comberg S Ewert H Wühl |
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Institution: | 1. 2. Physikalisches Institut, Rheinisch-Westf?lischen Technischen Hochschule Aachen, Templergraben 64, D-5100, Aachen, Federal Republic of Germany 2. Institut für Festk?rperforschung, Kernforschungsanlage Jülich GmbH, Postfach 365, D-5170, Jülich 1, Federal Republic of Germany
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Abstract: | Tunneling experiments on Be films condensed onto helium cooled substrates show that these films are homogeneously disordered with a uniform transition temperatureT c when Ge is codeposited, whereas thick films of pure Be do not grow homogeneously. For films of Be+10 at.% Ge a ratio 2Δ/k B T c =3.7 is found. Phonon induced structure in the tunneling density of states is not observed. The metastable phase obtained by quench-condensation is considered to be a disordered high-temperature phase of Be which transforms to the room temperature phase at about 60 K. |
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