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Andreev-reflection in YBCO “break-junctions”

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Zeitschrift für Physik B Condensed Matter

Abstract

We present measurements at break-junctions prepared of polycrystalline and textured YBCO-pellets with different resistances. The higher-ohmic junctions show the well known behaviour of HTSC-tunnel contacts with gap-like structures in their dI/dV-characteristics. Lower-ohmic junctions show the behaviour of point contacts. TheirI(VV)-and dI/dV-characteristics indicate all properties of the Andreev-reflection corresponding to the theory of Kümmel et al. [1] for BCS-superconductors. This could be an alternative method to study the energy gap in high temperature superconductors. Additionally we will show, that sharp minima in the dI/dV-characteristics could also be explained by the process of Andreev-reflection. For correcting the measured characteristics we substract the typical background to compare the characteristics directly with theoretical calculations. We studied the influence of magnetic fields up to 8 T.

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Authors and Affiliations

  1. Physikalisches Institut, Universität Würzburg, Am Hubland, W-8700, Würzburg, Federal Republic of Germany

    U. Zimmermann & K. Keck

  2. Fraunhofer Institut für Silikatforschung, W-8700, Würzburg, Federal Republic of Germany

    A. Thierauf

Authors
  1. U. Zimmermann
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  2. K. Keck
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  3. A. Thierauf
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Zimmermann, U., Keck, K. & Thierauf, A. Andreev-reflection in YBCO “break-junctions”. Z. Physik B - Condensed Matter 87, 275–279 (1992). https://doi.org/10.1007/BF01309280

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  • DOI: https://doi.org/10.1007/BF01309280

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