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s -Wave Symmetry Along the c -Axis and s + d In-plane Superconductivity in Bulk YBa2Cu4O8

Khasanov, R. ; Shengelaya, A. ; Karpinski, J. ; Bussmann-Holder, A. ; Keller, H. ; Müller, K.

In: Journal of Superconductivity and Novel Magnetism, 2008, vol. 21, no. 2, p. 81-85

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    Titre
    • s -Wave Symmetry Along the c -Axis and s + d In-plane Superconductivity in Bulk YBa2Cu4O8
    Auteur
    • Khasanov, R.. Physik-Institut der Universität Zürich, Winterthurerstrasse 190, 8057, Zürich, Switzerland
    • Shengelaya, A.. Physics Institute of Tbilisi State University, Chavchadze 3, 0128, Tbilisi, Georgia
    • Karpinski, J.. Laboratory for Solid State Physics, ETH Zürich, 8093, Zürich, Switzerland
    • Bussmann-Holder, A.. Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569, Stuttgart, Germany
    • Keller, H.. Physik-Institut der Universität Zürich, Winterthurerstrasse 190, 8057, Zürich, Switzerland
    • Müller, K.. Physik-Institut der Universität Zürich, Winterthurerstrasse 190, 8057, Zürich, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Journal of Superconductivity and Novel Magnetism, 2008, vol. 21, no. 2, p. 81-85. Springer US; http://www.springer-ny.com
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:316946
    Summary
    To clarify the order parameter symmetry of cuprates, the magnetic penetration depth λ was measured along the crystallographic directions a, b, and c in single crystals of YBa2Cu4O8 via muon spin rotation. This method is direct, bulk sensitive, and unambiguous. The temperature dependences of λ a −2 and λ b −2 exhibit an inflection point at low temperatures as is typical for two-gap superconductivity (TGS) with s+d-wave character in the planes. Perpendicular to the planes a pure s-wave gap is observed thereby highlighting the important role of c-axis effects. We conclude that these are generic and universal features in the bulk of cuprates