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Evidence for Two Distinct Anisotropies in the Oxypnictide Superconductors SmFeAsO0.8F0.2 and NdFeAsO0.8F0.2

Weyeneth, S. ; Puzniak, R. ; Zhigadlo, N. ; Katrych, S. ; Bukowski, Z. ; Karpinski, J. ; Keller, H.

In: Journal of Superconductivity and Novel Magnetism, 2009, vol. 22, no. 4, p. 347-351

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    Titre
    • Evidence for Two Distinct Anisotropies in the Oxypnictide Superconductors SmFeAsO0.8F0.2 and NdFeAsO0.8F0.2
    Auteur
    • Weyeneth, S.. Physik-Institut der Universität Zürich, Winterthurerstrasse 190, 8057, Zürich, Switzerland
    • Puzniak, R.. Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668, Warsaw, Poland
    • Zhigadlo, N.. Laboratory for Solid State Physics, ETH Zurich, 8093, Zurich, Switzerland
    • Katrych, S.. Laboratory for Solid State Physics, ETH Zurich, 8093, Zurich, Switzerland
    • Bukowski, Z.. Laboratory for Solid State Physics, ETH Zurich, 8093, Zurich, Switzerland
    • Karpinski, J.. Laboratory for Solid State Physics, ETH Zurich, 8093, Zurich, Switzerland
    • Keller, H.. Physik-Institut der Universität Zürich, Winterthurerstrasse 190, 8057, Zürich, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Journal of Superconductivity and Novel Magnetism, 2009, vol. 22, no. 4, p. 347-351. Springer US; http://www.springer-ny.com
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:315457
    Summary
    Single crystals of the oxypnictide superconductors SmFeAsO0.8F0.2 and NdFeAsO0.8F0.2 with T c in the range of 44 to 48 K were investigated by torque magnetometry. An analysis of the data in terms of a recently proposed model for the anisotropic magnetization in the superconducting state, treating the magnetic penetration depth anisotropy γ λ differently than the upper critical field anisotropy γ H , provides evidence that in the oxypnictide superconductors two distinct anisotropies are present. As a result γ λ differs significantly in magnitude and in temperature dependence from γ H , analogous to MgB2 but with a reversed sign of slope. This scenario strongly suggests a new multi-band mechanism in the novel class of oxypnictide high-temperature superconductors