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Fluctuation-Induced Diamagnetism above Tc in Al and Al—Ag Alloys

  • H. Kaufman
  • F. de la Cruz
  • G. Seidel

Abstract

We report here observations of the enhanced diamagnetism in bulk, cylindrical single crystals of pure aluminum and its alloys, for which the impurity in all cases is silver. The diamagnetism occurs above the thermodynamic transition temperature and is attributed to the formation of an appreciable number of Cooper pairs by means of fluctuations in the superconducting order parameter. It is clear from these measurements that these materials exhibit, or nearly exhibit, the universal magnetic field-dependent behavior previously reported by Gollub et al. 1 and successfully explained by the theories of Lee and Payne2 and Kurkijärvi et al. 3 for pure superconductors. Theoretical calculations by these same authors, extended to establish the form of the universal scaling law for both clean and dirty materials, will be shown, however, to be in disagreement with experiment.

Keywords

Superconducting Order Parameter Fluctuation Magnetization Flux Transformer Empirical Scaling Factor Dirty Material 
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References

  1. 1.
    J. P. Gollub, M. R. Beasley, and M. Tinkham, Phys. Rev. Lett. 25, 1646 (1970).ADSCrossRefGoogle Scholar
  2. 2.
    P. A. Lee and M. G. Payne, Phys. Rev. B 5, 923 (1972).ADSCrossRefGoogle Scholar
  3. 3.
    J. Kurkijärvi, V. Ambegaokar, and G. Eilenberger, Phys. Rev. B 5, 868 (1972).ADSCrossRefGoogle Scholar
  4. 4.
    H. L. Kaufman and F. de la Cruz, Sol. St. Commun. 9, 1729 (1971).ADSCrossRefGoogle Scholar
  5. 5.
    K. Maki and H. Takayama, J. Low Temp. Phys. 5 313 (1971), and private communication.Google Scholar
  6. 6.
    J. Claassen and W. W. Webb, private communication and this volume.Google Scholar

Copyright information

© Springer Science+Business Media New York 1974

Authors and Affiliations

  • H. Kaufman
    • 1
  • F. de la Cruz
    • 1
    • 2
  • G. Seidel
    • 1
  1. 1.Department of PhysicsBrown UniversityProvidenceUSA
  2. 2.Centro Atomico Bariloche—CNEASan Carlos de Bariloche, R. N.Argentina

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