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Multigap Superconductivity in GdFeAsO0.88 Evidenced by SnS-Andreev Spectroscopy

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Abstract

Using intrinsic multiple Andreev reflection effect (IMARE) spectroscopy we studied superconducting properties of nearly optimal oxygen-deficient GdFeAsO0.88 polycrystalline samples (bulk critical temperatures \(T_{C}^{\mathrm{bulk}} = 49\mbox{--}52~\mathrm{K}\)). Temperature dependences for two superconducting gaps Δ L,S (T) (\(T_{C}^{\mathrm{local}} = 48\mbox{--}50~\mathrm{K}\)) have been measured in the range from 4.2 to 50 K. The Δ L,S (T) dependences were found to deviate from the BCS-like function; this suggests an importance of the k-space (internal) proximity effect between the two condensates.

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Acknowledgements

This work was supported by Russian Foundation for Basic Research (grants 12-02-31269, 13-02-01451), Programs of Russian Academy of Sciences, Russian Ministry of Education and Sciences (project 11.519.11.6012), and was performed using facilities of the Shared Research Facilities Center at LPI. We thank I.V. Morozov and D. Daghero for fruitful discussions.

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Authors and Affiliations

  1. Lebedev Physical Institute RAS, 119991, Moscow, Russia

    T. E. Shanygina, Y. F. Eltsev, V. M. Pudalov, A. V. Sadakov & A. S. Usol’tsev

  2. Lomonosov Moscow State University, 119991, Moscow, Russia

    T. E. Shanygina, S. A. Kuzmichev, M. G. Mikheev, Y. G. Ponomarev, S. N. Tchesnokov & A. S. Usol’tsev

  3. Institute for High Pressure Physics RAS, 142190, Troitsk, Russia

    E. P. Khlybov & L. F. Kulikova

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  1. T. E. Shanygina
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  2. S. A. Kuzmichev
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  3. M. G. Mikheev
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  4. Y. G. Ponomarev
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  5. S. N. Tchesnokov
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  6. Y. F. Eltsev
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  7. V. M. Pudalov
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  8. A. V. Sadakov
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  9. A. S. Usol’tsev
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  10. E. P. Khlybov
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  11. L. F. Kulikova
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Correspondence to T. E. Shanygina.

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Shanygina, T.E., Kuzmichev, S.A., Mikheev, M.G. et al. Multigap Superconductivity in GdFeAsO0.88 Evidenced by SnS-Andreev Spectroscopy. J Supercond Nov Magn 26, 2661–2664 (2013). https://doi.org/10.1007/s10948-013-2155-y

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  • DOI: https://doi.org/10.1007/s10948-013-2155-y

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