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

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Abstract

Single crystals of the oxypnictide superconductor SmFeAsO0.8F0.2 with T c≃45(1) K were investigated by torque magnetometry. The crystals of mass ≤0.1 μg 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.

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Authors and Affiliations

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

    S. Weyeneth, U. Mosele, S. Kohout, J. Roos & H. Keller

  2. Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668, Warsaw, Poland

    R. Puzniak

  3. Laboratory for Solid State Physics, ETH Zürich, 8093, Zürich, Switzerland

    N. D. Zhigadlo, S. Katrych, Z. Bukowski & J. Karpinski

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  1. S. Weyeneth
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  2. R. Puzniak
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  3. U. Mosele
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  4. N. D. Zhigadlo
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  5. S. Katrych
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  6. Z. Bukowski
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  7. J. Karpinski
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  8. S. Kohout
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  9. J. Roos
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  10. H. Keller
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Correspondence to S. Weyeneth.

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Weyeneth, S., Puzniak, R., Mosele, U. et al. Anisotropy of Superconducting Single Crystal SmFeAsO0.8F0.2 Studied by Torque Magnetometry. J Supercond Nov Magn 22, 325–329 (2009). https://doi.org/10.1007/s10948-008-0413-1

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  • DOI: https://doi.org/10.1007/s10948-008-0413-1

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