- Autor(in)
- Referenz
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10 Fortmann, J., u. W. Buckel, Z. Physik 162 (1961) 93.
11 Taylor, B. N., Dissertation, University of Pennsylvania 1963, Philadelphia, Pennsylvania/USA.
12 Hilsch, P., u. R. Hilsch, Z. Physik 180 (1964) 10.
13 Unger, E., Diplomarbeit, Erlangen 1950.
14 Buckel, W., u. R. E. Glover III: Conf. de Physique des Basses Temp., Paris 1955.
15 Rochlin, G. J., Physic. Rev. 153 (1967) 513.
16 Anderson, P. W., J. Physic. Chem. Solids 11 (1959) 26.
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1 Bardeen, J., L. N. Cooper u. J. R. Schrieffer, Physic. Rev. 108 (1957) 1175.
2 Swihart, J. C., D. J. Scalapino u. Y. Wada, Physic. Rev. Letters 14 (1965) 106.
3 Für eine Übersicht über verschiedene Wechselwirkungsmodelle sei auf folgenden Bericht verwiesen: Douglas, jr., D. H. u. L. M. Falicov, Progress in Low Temperature Physics, Ed. C. J. Gorter, Bd. IV, S. 97 - 193, Amsterdam: North-Holland Publishing Co. 1964.
4 Adler, J. G., J. E. Jackson u. T. A. Will, Physic. Letters 24 A (1967) 407.
5 Cohen, R. W., B. Abeles u. G. S. Weisbarth, Physic. Rev. Letters 18 (1967) 336.
6 Buckel, W., u. R. Hilsch, Z. Physik 132 (1952) 420.
7 Schertel, A., Physik. Verh. 2 (1951) 102.
8 Rühl, W., Z. Physik 138 (1954) 121.
9 Buckel, W., Z. Physik 138 (1954) 136.
- Seitenbereich
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0015 - 0024
- Zusammenfsg.
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We have performed tunnelmeasurements on evaporated tin-films with various amounts of copper added. The tunneljunctions were evaporated and cooled down to helium temperatures in situ in a metal-cryostat. Tin-copper-films, which are condensed at low temperatures, are amorphous. They have critical temperatures from 7 °K to 3,5 °K depending on the content of copper. Tunnelmeasurements indicate that the high transition temperature belongs to a superconductor with strong coupling, whereas the lower critical temperature is characteristic of a weak coupling superconductor. Structures in tunnelcharacteristics and transition-curves indicate that a film can have several energy-gaps and that regions with strong and weak coupling can exist in the films. - Describing the metal-cryostat we point out that one can reach temperatures below 1 °K with small pumping rates by diminishing the Hell film flux.
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