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Scaling of Complex Conductivity for a Percolating Metal-Insulator Composite with Inter Granular Tunneling Above and below the Superconducting Transition

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Abstract

The complex conductivity was measured on 3d granular NbC-KCl composite samples at varying metal volume fraction p, frequency ω and temperature above and below the superconductivity critical Tc. The observed frequency dispersion is anomalous in that it is not in accord with the scaling theory of percolation transition. The results are compared with a recently developed scaling theory, which takes both intercluster tunneling and intercluster capacitance into account. The experimental estimates for the new critical exponents are in reasonable agreement with the theory. The very low value of the crossover frequency can also be understood. We also present the data showing the dispersion of the complex conductivity well below the superconducting transition Tc of NbC.

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Authors and Affiliations

  1. Department of Physics, University of the Witwatersrand,Johannesburg, South Africa

    D. S. Mclachlan & A. B. Pakhomov

  2. Ioffe Physical Technical Institute, Saint-Petersbourg, 194021, Russia

    I. I. Oblachova

  3. Materials Sciences,B5 Liège Univertsity, Liège, 4000, Belgium

    F. Brouers

  4. Center for Problems in Electrodynamics Russian Academy of Sciences, Moscow, Russia

    A. Sarychev

Authors
  1. D. S. Mclachlan
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  2. A. B. Pakhomov
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  3. I. I. Oblachova
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  4. F. Brouers
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  5. A. Sarychev
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Mclachlan, D.S., Pakhomov, A.B., Oblachova, I.I. et al. Scaling of Complex Conductivity for a Percolating Metal-Insulator Composite with Inter Granular Tunneling Above and below the Superconducting Transition. MRS Online Proceedings Library 411, 333–337 (1995). https://doi.org/10.1557/PROC-411-333

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  • DOI: https://doi.org/10.1557/PROC-411-333

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