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Aspects of Quantum Coherence in Superconducting Rings: Flux Quantisation in a Heavy Fermion/Niobium Hybrid Ring and the Origin of Noise in a HTC DC SQUID

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Electronic Properties of High-Tc Superconductors

Part of the book series: Springer Series in Solid-State Sciences ((SSSOL,volume 113))

Abstract

We report recent measurements of flux quantisation in a hybrid ring formed from niobium and the newly discovered heavy fermion superconductor UPd2Al3 (Tc ~ 2K) providing an unambiguous demonstration of quantum coherence of the superconducting wave function between the heavy fermion and the conventional BCS superconductor. I/V characteristics of the edge-contacts formed across the UPd2Al3/Nb contact regions suggest a relatively weak coupling of the heavy fermion/niobium superconducting wave functions. In the second experiment, a novel method for measuring noise in superconducting circuits is illustrated by measurements on a Conductus do SQUID incorporating two bi-epitaxial weak-link junctions. The noise is shown to arise from fluctuations in critical currents across the two junctions, as independently determined by noise measurements on the junctions themselves after physical isolation from the SQUID. There was no evidence for any increase in noise in either SQUID device or constituent junctions associated with thermally induced motion of flux trapped within the device on cooling.

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Author information

Authors and Affiliations

  1. Superconductivity Research Group, University of Birmingham, Birmingham, B15 2TT, UK

    C. E. Gough, S. G. Hammond, Y. He & C. M. Muirhead

  2. Institut für Festkörperphysik, Techn. Hochschule Darmstadt, W-6100, Darmstadt, Fed. Rep. of Germany

    G. Geibel, C. Schank & F. Steglich

  3. Conductus Inc., 969 West Maude Avenue, Sunnyvale, CA, USA

    M. S. Colclough & K. Char

Authors
  1. C. E. Gough
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  2. S. G. Hammond
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  3. Y. He
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  4. C. M. Muirhead
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  5. G. Geibel
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  6. C. Schank
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  7. F. Steglich
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  8. M. S. Colclough
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  9. K. Char
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Editor information

Editors and Affiliations

  1. Institut für Festkörperphysik, Universität Wien, Strudlhofgasse 4, A-1090, Wien, Austria

    Hans Kuzmany

  2. 2. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, W-7000, Stuttgart, Fed. Rep. of Germany

    Michael Mehring

  3. Institut für Nukleare Festkörperphysik, Kernforschungszentrum Karlsruhe, Postfach 3640, W-7500, Karlsruhe, Fed. Rep. of Germany

    Jörg Fink

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© 1993 Springer-Verlag Berlin, Heidelberg

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Gough, C.E. et al. (1993). Aspects of Quantum Coherence in Superconducting Rings: Flux Quantisation in a Heavy Fermion/Niobium Hybrid Ring and the Origin of Noise in a HTC DC SQUID. In: Kuzmany, H., Mehring, M., Fink, J. (eds) Electronic Properties of High-Tc Superconductors. Springer Series in Solid-State Sciences, vol 113. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-84865-0_13

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  • DOI: https://doi.org/10.1007/978-3-642-84865-0_13

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-84867-4

  • Online ISBN: 978-3-642-84865-0

  • eBook Packages: Springer Book Archive

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