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

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Abstract

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.

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Authors and Affiliations

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

    S. Weyeneth & 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 Zurich, 8093, Zurich, 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. N. D. Zhigadlo
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  4. S. Katrych
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  5. Z. Bukowski
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  6. J. Karpinski
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  7. H. Keller
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Correspondence to S. Weyeneth.

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Weyeneth, S., Puzniak, R., Zhigadlo, N.D. et al. Evidence for Two Distinct Anisotropies in the Oxypnictide Superconductors SmFeAsO0.8F0.2 and NdFeAsO0.8F0.2 . J Supercond Nov Magn 22, 347–351 (2009). https://doi.org/10.1007/s10948-009-0445-1

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  • DOI: https://doi.org/10.1007/s10948-009-0445-1

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