Electrical transport properties of ultrathin superconducting Pb films.

ORAL

Abstract

We present electrical transport properties of metallic ultra thin epitaxially grown Pb (111) films on Si (111) substrate. We observed a reduced superconducting transition temperature from bulk Pb using electrical resistivity measurements and deduced the temperature dependence of out-of-plane critical magnetic fields from the sheet resistance R as a function of the applied magnetic field. These results are consistent with M. M. Ozer et al.,$^{1}$ obtained by magnetic techniques. We identified the mean field critical temperature and current densities from I-V curves in zero magnetic field. We explored the possible presence of Kosterlitz-Thouless transition (T$_{KT})$ in this system. We discuss these results based on the Ginzburg-Landau Coloumb-Gas (GLCG) model for 2D vortex fluctuations. 1. M. M. Ozer, J. R. Thompson, and H. H. Weitering, Nature Physics, \textbf{2}, 173 (2006).

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Authors

  • R.P. Panguluri

    • Wayne State University-Physics Department
    • Department of Physics and Astronomy, Wayne State University, Detroit, MI 48201

  • M.M. Ozer

    • Department of Physics and Astronomy, The University of Tennessee, Knoxville, TN 37996

  • James R Thompson

    • University of Tennessee, ORNL
    • University of Tennessee
    • Department of Physics and Astronomy, The University of Tennessee, Knoxville, TN 37996;Condensed Matter Sciences Division, ORNL, Oak Ridge, TN 37831
    • U. of Tennessee
    • The University of Tennessee

  • Hanno Weitering

    • Department of Physics and Astronomy, The University of Tennessee, Knoxville, TN 37996;Condensed Matter Sciences Division, ORNL, Oak Ridge, TN 37831
    • The University of Tennessee
    • University of Tennessee, Oak Ridge National Laboratory

  • B.E. Nadgorny

    • Wayne State University-Physics Department
    • Department of Physics and Astronomy, Wayne State University, Detroit, MI 48201