Abstract
The transition temperatureT c and the critical fieldH c of lead were measured as a function of the concentration of lattice defects. The defects were generated by plastic deformation at liquid Helium temperatures and reduced by annealing.
T c is rather insensitive to defects. With increasing residual resistance ratio ρ the transition temperature increases and finally reaches a constant value with onlyΔT c ≈4.5 · 10−3 °K. On the other hand a deformation of the same amount increasesH c more than twice as much as the starting value. Annealing to room-temperature reducesρ, T c andH c to their initial values. During the annealing process,T c shows a distinct maximum and ρ a marked step. Contrary to this behaviourH c decreases linearly during the whole region of annealing. Taking into account the strong influence of ρ uponH c a picture is given about the mechanism of deformation, which allows to understand the results qualitatively. The changes ofT c produced by elastic strain were also measured. The results are in quantitative agreement with those of pressure experiments.
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Herrn Prof. Dr. W.Buckel möchte ich meinen aufrichtigen Dank sagen, einmal weil er mir die Möglichkeit gab, diese Arbeit in seinem Institut auszuführen und zum anderen für sein intensives Interesse und die Unterstützung, die er mir durch viele fördernde Diskussionen zuteil werden ließ. Der Deutschen Forschungsgemeinschaft danke ich für die Bereitstellung von Geräten.
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Lüders, K. Einfluß von Gitterstörungen auf die Supraleiteigenschaften von Blei. Z. Physik 188, 397–411 (1965). https://doi.org/10.1007/BF01339873
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DOI: https://doi.org/10.1007/BF01339873