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  4. Andreev-reflection in YBCO "break-junctions"
 
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1992
Journal Article
Title

Andreev-reflection in YBCO "break-junctions"

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. Their I(VV)- and dI/dV-characteristics indicate all properties of the Anreev-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 studie the influence of magnetic fields up to 8 T.
Author(s)
Zimmermann, U.
Keck, K.
Thierauf, A.
Journal
Zeitschrift für Physik. B  
DOI
10.1007/BF01309280
Language
English
Fraunhofer-Institut für Silicatforschung ISC  
Keyword(s)
  • break junction

  • superconductor

  • tunnel contact

  • YBCO

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