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Energy gap distribution of HgBa2CuO4+δ investigated by scanning tunneling microscopy/spectroscopy

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Abstract

The superconducting energy gap distribution of poly crystalline HgBa2CuO4+δ samples of differing oxygen doping levels (Tc = 94 K and Tc = 96 K) is determined by scanning tunneling spectroscopy (STS) using a low temperature scanning tunneling microscope (STM). From histograms of energy gap values the presence of two distinct energy gaps is inferred (Δ1=8.5±1.6meV and Δ2=15.1±1.4meV). We attribute the different gaps to different crystallographic faces, implying a non-BCS electron-electron pairing mechanism.

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Authors and Affiliations

  1. Institute of Physics, University of Basel, Klingelbergstrasse 82, CH-4056, Basel, Switzerland

    P. Jess, U. Hubler, H. P. Lang, H. -J. Güntherodt, K. Lüders & E. V. Antipov

  2. Institut für Experimentalphysik, FU Berlin, Arnimallee 14, D-14195, Berlin, Germany

    K. Lüders

  3. Department of Chemistry, Moscow State University, 119899, Moscow, Russian Federation

    E. V. Antipov

Authors
  1. P. Jess
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  2. U. Hubler
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  3. H. P. Lang
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  4. H. -J. Güntherodt
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  5. K. Lüders
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  6. E. V. Antipov
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Jess, P., Hubler, U., Lang, H.P. et al. Energy gap distribution of HgBa2CuO4+δ investigated by scanning tunneling microscopy/spectroscopy. J Low Temp Phys 105, 1243–1248 (1996). https://doi.org/10.1007/BF00753870

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  • DOI: https://doi.org/10.1007/BF00753870

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