Flux entry fields in amorphous superconductors View Full Text


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Article Info

DATE

1984-01

AUTHORS

S. J. Poon, P. L. Dunn

ABSTRACT

We have measured the flux entry fields (lower critical fieldsHc1) of homogeneous and inhomogeneous extreme type II amorphous superconductors based on zirconium. Samples are prepared by melt quenching at both ambient and elevated substrate temperatures. The degree of homogeneity is classified according to the widths of both inductive and resistive transitions. TheHc1 (T) curves for “powdered” homogeneous samples with weak flux pinning are found to be in good agreement with Maki's theory. Taking into account the electron-phonon renormalization effect, we deduce the zero-temperature energy gap values 2Δo/kBTc to be BCS like. On the other hand, anomalousHc1 (T) curves are observed in “powdered” inhomogeneous samples and strips from homogeneous samples parallel to the applied field. Appreciable irreversibility effects are also observed. The latter results are discussed qualitatively in terms of bulk and surface inhomogeneity effects. More... »

PAGES

81-95

References to SciGraph publications

  • 1978-10. The upper and lower critical fields of high-κ amorphous superconductors in JOURNAL OF LOW TEMPERATURE PHYSICS
  • 1959-06. Die thermodynamischen Funktionen des Supraleiters in ZEITSCHRIFT FÜR PHYSIK A HADRONS AND NUCLEI
  • 1974-03. Temperature dependence ofHc2 andк1 in strong coupling superconductors in JOURNAL OF LOW TEMPERATURE PHYSICS
  • 1979. Magnetic Flux Structures in Superconductors in NONE
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    http://scigraph.springernature.com/pub.10.1007/bf00681478

    DOI

    http://dx.doi.org/10.1007/bf00681478

    DIMENSIONS

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