Abstract
We report on the superconducting properties of a series of sputtered, amorphous Zr100−x Cux (19≤x≤48) alloys. From the thermodynamic parameters, we conclude that there is a very good agreement with the BCS theory on the high-Cu-concentration side. When Zr content increases, and then the coupling strength, a very continuous and progressive deviation from the BCS limit occurs, which is in rather good agreement with theoretical predictions for crystalline alloys. However, a departure develops at high Zr concentration. Despite the surprising behavior of the electronic density of states Nγ(E F) characteristic of these highly disordered alloys, a correlation is found between Nγ(E F) and the Ginzburg-Landau parameter κ.
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Zougmore, F., Laborde, O. & Lasjaunias, J.C. Gradual deviations to BCS superconductivity and Ginzburg-Landau parameters of Zr-Cu amorphous alloys. J Low Temp Phys 69, 189–201 (1987). https://doi.org/10.1007/BF00682656
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DOI: https://doi.org/10.1007/BF00682656