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Unusual Temperature-Dependent Behavior of the Bi2Sr2CaCu2O8+δ Energy Gap

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Electronic Properties of High-Tc Superconductors

Part of the book series: Springer Series in Solid-State Sciences ((SSSOL,volume 113))

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Abstract

The electronic structure close to the Fermi level of Bi2Sr2CaCu2O8+δwas studied in the superconducting state by high resolution angle-integrated, resonant photoemission spectroscopy as a function of temperature and submonolayer Au coverage. In addition to the opening of an energy gap below Tc, described by a reduced gap parameter 2Δ (20K)/kBTc ≈ 8, a relatively sharp density of states feature is discovered within the gap. Resonant enhancement at a photon energy of 18 eV indicates that this feature is oxygen-derived. Its relative spectral weight decreases with temperature, and also under submonolayer gold coverage. This suggests that it either originates from oxygen atoms in the Bi-O planes exposed at the cleaved (001) surface, or possibly the ‘apex’ oxygen atoms situated immediately below.

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References

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Authors and Affiliations

  1. Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, W-1000, Berlin 33, Fed. Rep. of Germany

    C. T. Simmons, S. Molodtsov, G. Stadermann, C. Laubschat & G. Kaindl

Authors
  1. C. T. Simmons
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  2. S. Molodtsov
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  3. G. Stadermann
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  4. C. Laubschat
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  5. G. Kaindl
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Editor information

Editors and Affiliations

  1. Institut für Festkörperphysik, Universität Wien, Strudlhofgasse 4, A-1090, Wien, Austria

    Hans Kuzmany

  2. 2. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, W-7000, Stuttgart, Fed. Rep. of Germany

    Michael Mehring

  3. Institut für Nukleare Festkörperphysik, Kernforschungszentrum Karlsruhe, Postfach 3640, W-7500, Karlsruhe, Fed. Rep. of Germany

    Jörg Fink

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© 1993 Springer-Verlag Berlin, Heidelberg

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Simmons, C.T., Molodtsov, S., Stadermann, G., Laubschat, C., Kaindl, G. (1993). Unusual Temperature-Dependent Behavior of the Bi2Sr2CaCu2O8+δ Energy Gap. In: Kuzmany, H., Mehring, M., Fink, J. (eds) Electronic Properties of High-Tc Superconductors. Springer Series in Solid-State Sciences, vol 113. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-84865-0_24

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  • DOI: https://doi.org/10.1007/978-3-642-84865-0_24

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-84867-4

  • Online ISBN: 978-3-642-84865-0

  • eBook Packages: Springer Book Archive

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