Evidence for large-scale structures in granular superconductors

S. A. Dodds; S. N. Harrington; R. S. Newrock; K. Loeffler

doi:10.1103/PhysRevB.33.3115

Evidence for large-scale structures in granular superconductors

S. A. Dodds, S. N. Harrington, R. S. Newrock, and K. Loeffler

Phys. Rev. B 33, 3115 – Published 1 March 1986

Abstract

We have made measurements of the temperature and angular dependence of the critical field for superconductivity in thin-film specimens of Al: ${Al}_{2}$ $O_{3}$ composites. The measurements lead us to infer that these specimens are composed of one or more layers with thicknesses between the grain size and the overall film thickness. This inference is corroborated by measurements of the fluctuation conductivity. Preliminary data on Al:Te composite films suggest that nonrandom structures of similar scale are also present in this material.

Received 8 August 1985

DOI:https://doi.org/10.1103/PhysRevB.33.3115

Authors & Affiliations

S. A. Dodds and S. N. Harrington

Physics Department, Rice University, Houston, Texas 77251

R. S. Newrock and K. Loeffler

Physics Department, University of Cincinnati, Cincinnati, Ohio 45221

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Vol. 33, Iss. 5 — 1 March 1986

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