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Angular Dependent Critical Fields in NbTi-Ge Superlattices in the Weakly Localized Regime

Published online by Cambridge University Press:  26 February 2011

Ben Y. Jin,
J. B. Ketterson,
J. E. Hilliard,
E. J. McNiff Jr,
S. Foner and
Ivan K. Schuller
Ben Y. Jin
Affiliation:
Materials Research Center, Northwestern University, Evanston, IL
J. B. Ketterson
Affiliation:
Materials Research Center, Northwestern University, Evanston, IL
J. E. Hilliard
Affiliation:
Materials Research Center, Northwestern University, Evanston, IL
E. J. McNiff Jr
Affiliation:
Francis Bitter National Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, MA
S. Foner
Affiliation:
Francis Bitter National Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, MA
Ivan K. Schuller
Affiliation:
Argonne National Laboratory, Argonne, IL.
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Abstract

The angular dependence of the upper critical fields, Hc(θ) for a set of NbTi-Ge superlattices were studied at various temperatures. The behavior of Hc(θ) at lower temperatures deviates from the Tinkham expression which is expected to be valid only in the Ginzberg-Landau regime close to Tc. We examine a model for calculating Hc(θ) involving the lowest eigenvalue of the gauge invariant diffusion equation (subject to boundary conditions appropriate to a slab) in the de Gennes expression for the upper critical field of a dirty superconductor at all temperatures. The disorder related localization and interaction effects as well, as the paramagnetic limiting effect, are also considered.

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References

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