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Two-Gap Superconductivity in the Cuprate Superconductor La1.83Sr0.17CuO4

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High Tc Superconductors and Related Transition Metal Oxides

Abstract

Based on the idea of K.A. Müller [Nature (London) 377, 133 (1995)] that two superconducting condensates with s-wave and d-wave symmetries are present in high-temperature cuprate superconductors, we performed measurements of the in-plane magnetic field penetration depth (λ ab) in single-crystal La1.83Sr0.17CuO4 by means of the muon-spin rotation technique. The temperature dependence of λ −2 ab has an inflection point around 10–15 K, suggesting the opening of two superconducting gaps: a large gap (Δ1 d) with a d-wave and a small gap (Δ2 s) with an s-wave symmetry. The zero-temperature values of the gaps at μ 0 H =, obtained from the global fit of muon data, were found to be Δ1 d(0) = 8.2(1) meV and Δ2 s(0) = meV. With increasing magnetic field the contribution of Δ2 s decreases substantially, in contrast to an almost constant contribution of Δd 1. The magnetic field dependence of the transition temperature T c and the distribution of the local magnetic fields P(B) in La1.83Sr0.17CuO4 superconductor in the mixed state were also found to be consistent with the presence of two superconducting gaps.

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Authors and Affiliations

  1. Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057, Zürich, Switzerland

    R. Khasanov & H. Keller

  2. Physics Institute of Tbilisi State University, Chavchavadze 3, GE-0128, Tbilisi, Georgia

    A. Shengelaya

  3. Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1D, 70569, Stuttgart, Germany

    A. Bussmann-Holder

Authors
  1. R. Khasanov
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  2. A. Shengelaya
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  3. A. Bussmann-Holder
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  4. H. Keller
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Corresponding author

Correspondence to R. Khasanov .

Editor information

Annette Bussmann-Holder Hugo Keller

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Khasanov, R., Shengelaya, A., Bussmann-Holder, A., Keller, H. (2007). Two-Gap Superconductivity in the Cuprate Superconductor La1.83Sr0.17CuO4 . In: Bussmann-Holder, A., Keller, H. (eds) High Tc Superconductors and Related Transition Metal Oxides. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-71023-3_14

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