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Peak in the temperature dependence of the c-axis Josephson current in Bi2Sr2CaCu2O8+x intrinsic Josephson junctions

  • HTSC—Granular Superconductors
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Czechoslovak Journal of Physics Aims and scope

Abstract

We have measured the temperature dependence of the c-axis critical current (I c (T)) in intrinsic Josephson tunnel junctions in single crystal Bi2Sr2CaCu2O8+x. Stacks (10×50 μm2) were fabricated on the surfaces of the single crystals by photolithography and Ar-ion milling. The temperature dependence of the critical current deviates from the Ambegaokar-Baratoff relation. The most striking deviation is a peak inI c (T) at ∼80 K. The peak is suppressed if we apply a small (∼50G) magnetic field along the c-axis. The position of the peak does not change in a magnetic field. At∼60K we observe an increase in the flucuations of the critical current as the temperature is decreased. In some samples we also observe some small features inI c (T) at this temperature.

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Authors and Affiliations

  1. Department of Physics, Chalmers University of Technology, S-412 96, Göteborg, Sweden

    Nikas Mros, August Yurgens, Dag Winkler & Tord Claeson

  2. P. L. Kapitza Institute, Kosygina 2, 117334, Moscow, Russia

    Nicolay Zavaritsky

Authors
  1. Nikas Mros
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  2. August Yurgens
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  3. Dag Winkler
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  4. Nicolay Zavaritsky
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  5. Tord Claeson
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Mros, N., Yurgens, A., Winkler, D. et al. Peak in the temperature dependence of the c-axis Josephson current in Bi2Sr2CaCu2O8+x intrinsic Josephson junctions. Czech J Phys 46 (Suppl 3), 1273–1274 (1996). https://doi.org/10.1007/BF02562751

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  • DOI: https://doi.org/10.1007/BF02562751

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