Large decrease in the critical temperature of superconducting LaFeAsO0.85 compounds doped with 3% atomic weight of nonmagnetic Zn impurities

Y. F. Guo, Y. G. Shi, S. Yu, A. A. Belik, Y. Matsushita, M. Tanaka, Y. Katsuya, K. Kobayashi, I. Nowik, I. Felner, V. P. S. Awana, K. Yamaura, and E. Takayama-Muromachi
Phys. Rev. B 82, 054506 – Published 5 August 2010
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  • INTRODUCTION
  • EXPERIMENTAL
  • RESULTS AND DISCUSSION
  • ACKNOWLEDGEMENTS
    • References

    Abstract

    We observed a large decrease in Tc by no more than 3 at. % of Zn doped into the Tc-optimized superconductor LaFeAsO0.85 (Tc=26 K), confirmed by measurements of electrical resistivity, magnetic susceptibility, specific heat, Mössbauer spectroscopy, Hall coefficient, and an electron probe microanalysis. The rate ∼9 K/% is remarkably higher than others achieved by nonmagnetic impurities. The Tc suppression is likely due to pair breaking caused by scattering associated with the highly localized electronic state of Zn in the Fe2As2 layer. If this is true, the present result well accords with the theoretical prediction that suggests a sign reversal s-wave pairing model for the Fe-pnictide superconductors.

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    • Received 12 June 2010

    DOI:https://doi.org/10.1103/PhysRevB.82.054506

    ©2010 American Physical Society

    Authors & Affiliations

    Y. F. Guo1,*, Y. G. Shi2, S. Yu3, A. A. Belik1,2, Y. Matsushita4, M. Tanaka4, Y. Katsuya5, K. Kobayashi4, I. Nowik6, I. Felner6, V. P. S. Awana1,7, K. Yamaura2,3, and E. Takayama-Muromachi2

    • 1International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
    • 2Transformative Research-Project on Iron Pnictides (TRIP), JST, 1-1 Namiki, Tsukuba, 305-0044 Ibaraki, Japan
    • 3Superconducting Materials Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba, 305-0044 Ibaraki, Japan
    • 4NIMS Beamline Station at SPring-8, National Institute for Materials Science, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
    • 5SPring-8 Service Co. Ltd., 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
    • 6Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel
    • 7National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi 110 012, India

    • *guo.yanfeng@nims.go.jp

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    Vol. 82, Iss. 5 — 1 August 2010

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