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DC and ac Josephson effects observed in high-temperature superconductor YBaCuO

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Abstract

We report the observation of the dc and ac Josephson effect and quasiparticle tunnelling in the high-temperature superconductor YBaCuO. The observation is made at 4.2 K. These effects were observed in a junction made by a niobium tip pressed against a high-T c sample of YBaCuO ceramic. We observed a clean dc Josephson effect with a critical currentI c ≈2 μA and the ac effect with Shapiro steps corresponding toV=(hf/2e)n. The nature of the junction is not clear; however, we suggest that all observed effects can be explained by assuming a singlet pairing state in the ceramic. We have also observed a very peculiar noise behavior along theV-I characteristic.

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Authors and Affiliations

  1. Institute of Physics, Czechoslovak Academy of Sciences, Řež, Czechoslovakia

    J. Kuzník, M. Odehnal & S. Šafrata

  2. Department of Electrical Engineering, Technical University Prague, Prague, Czechoslovakia

    J. Endal

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  1. J. Kuzník
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  2. M. Odehnal
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  3. S. Šafrata
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  4. J. Endal
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Kuzník, J., Odehnal, M., Šafrata, S. et al. DC and ac Josephson effects observed in high-temperature superconductor YBaCuO. J Low Temp Phys 69, 313–323 (1987). https://doi.org/10.1007/BF00682664

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  • DOI: https://doi.org/10.1007/BF00682664

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