Multigap Superconductivity in GdFeAsO$_{0.88}$ Evidenced by SnS-Andreev Spectroscopy

T. E. Shanygina; S. A. Kuzmichev; M. G. Mikheev; Ya. G. Ponomarev; S. N. Tchesnokov; Yu. F. Eltsev; V. M. Pudalov; A. V. Sadakov; A. S. Usol'tsev; E. P. Khlybov; L. F. Kulikova

doi:10.1007/s10948-013-2155-y

Multigap Superconductivity in GdFeAsO$_{0.88}$ Evidenced by SnS-Andreev Spectroscopy

Superconductivity 2013-07-11 v1

Authors: T. E. Shanygina , S. A. Kuzmichev , M. G. Mikheev , Ya. G. Ponomarev , S. N. Tchesnokov , Yu. F. Eltsev , V. M. Pudalov , A. V. Sadakov , A. S. Usol'tsev , E. P. Khlybov , L. F. Kulikova

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Abstract

Using intrinsic multiple Andreev reflection effect (IMARE) spectroscopy we studied superconducting properties of nearly optimal oxygen-deficient GdFeAsO $_{0.88}$ polycrystalline samples (bulk critical temperatures $T_C^{bulk} = 49 \div 52$ \,K). Temperature dependences for two superconducting gaps $\Delta_{L,S}(T)$ ( $T_C^{local} = 48 \div 50$ \,K) have been measured in the range from 4.2 to 50\,K. The $\Delta_{L,S}(T)$ 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.

Keywords

multigap superconductivity GdFeAsO Andreev spectroscopy IMARE superconducting gaps proximity effect iron-based superconductors

Cite

@article{arxiv.1211.0257,
  title  = {Multigap Superconductivity in GdFeAsO$_{0.88}$ Evidenced by SnS-Andreev Spectroscopy},
  author = {T. E. Shanygina and S. A. Kuzmichev and M. G. Mikheev and Ya. G. Ponomarev and S. N. Tchesnokov and Yu. F. Eltsev and V. M. Pudalov and A. V. Sadakov and A. S. Usol'tsev and E. P. Khlybov and L. F. Kulikova},
  journal= {arXiv preprint arXiv:1211.0257},
  year   = {2013}
}

Comments

4 pages, 3 figures. Submitted to J. Supercond. Novel Magn. (Superstripes 2012 Proceedings)

Multigap Superconductivity in GdFeAsO$_{0.88}$ Evidenced by SnS-Andreev Spectroscopy

Abstract

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