Abstract
Al-films were evaporated from Al2O3-crucibles or W-boats onto substrates held at 4.2 K or at room temperature (R.T.). The superconducting transition temperatureT c was measured in situ, while the oxygen contentC o of the films was determined by Rutherford-backscattering. Layers evaporated at R.T. from Al2O3-crucibles exhibit aT c vs.C o-relation like granular Al-films. For layers quench-condensed from W-boats without an external oxygen source typicalT c -values of 2.5 K and oxygen concentrations of 10 at % were found. In case of quench-condensation from Al2O3-crucibles it is concluded from theT c vs.C o-relation that oxygen is incorporated into the films in the form of Al2O-molecules. The different behavior of theT c vs.C o-curves will be discussed.
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Nittmann, M., Ziemann, P., Buckel, W. et al. Dependence of the superconducting transition temperature of quench-condensed aluminium-films on the oxygen content. Z. Physik B - Condensed Matter 41, 205–209 (1981). https://doi.org/10.1007/BF01294423
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DOI: https://doi.org/10.1007/BF01294423