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Anisotropy of Superconducting Single Crystal SmFeAsO0.8F0.2 Studied by Torque Magnetometry

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

In: Journal of Superconductivity and Novel Magnetism, 2009, vol. 22, no. 4, p. 325-329

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    Titre
    • Anisotropy of Superconducting Single Crystal SmFeAsO0.8F0.2 Studied by Torque Magnetometry
    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
    • Mosele, U.. Physik-Institut der Universität Zürich, Winterthurerstrasse 190, 8057, Zürich, Switzerland
    • Zhigadlo, N.. Laboratory for Solid State Physics, ETH Zürich, 8093, Zürich, Switzerland
    • Katrych, S.. Laboratory for Solid State Physics, ETH Zürich, 8093, Zürich, Switzerland
    • Bukowski, Z.. Laboratory for Solid State Physics, ETH Zürich, 8093, Zürich, Switzerland
    • Karpinski, J.. Laboratory for Solid State Physics, ETH Zürich, 8093, Zürich, Switzerland
    • Kohout, S.. Physik-Institut der Universität Zürich, Winterthurerstrasse 190, 8057, Zürich, Switzerland
    • Roos, J.. Physik-Institut der Universität Zürich, Winterthurerstrasse 190, 8057, Zürich, 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. 325-329. Springer US; http://www.springer-ny.com
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:314569
    Summary
    Single crystals of the oxypnictide superconductor SmFeAsO0.8F0.2 with T c≃45(1) K were investigated by torque magnetometry. The crystals of mass ≤0.1μg were grown by a high-pressure cubic anvil technique. The use of a high-sensitive piezoresistive torque sensor made it possible to study the anisotropic magnetic properties of these tiny crystals. The anisotropy parameter γ was found to be field independent, but varies strongly with temperature ranging from γ≃8 at T≲T c to γ≃23 at T≃0.4T c. This unusual behavior of γ signals unconventional superconductivity