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28 April 2024

» arxiv » 1302.5326

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Experimental study of intrinsic multiple Andreev reflections effect in GdO(F)FeAs superconductor array junctions
T.E. Kuzmicheva ; S.A. Kuzmichev ; M.G. Mikheev ; Ya.G. Ponomarev ; S.N. Tchesnokov ; Yu.F. Eltsev ; V.M. Pudalov ; A.V. Sadakov ; A.S. Usoltsev ; E.P. Khlybov ; L.F. Kulikova ;
Date:	21 Feb 2013
Abstract:	We report the first observation of the intrinsic multiple Andreev reflections effect (IMARE) in S-n-S-...-S-arrays (S = superconductor, n = normal metal) formed by "break-junction" technique in GdO(F)FeAs superconductor (Tc = 48 - 53 K). We show that superconducting gap peculiarities at dI/dV-spectra sharpen dramatically in the arrays as compared with that in the single-contact spectra; this enables to improve significantly accuracy of the bulk superconducting parameters determination. Using IMARE, we determined the large and the small gap values Delta_L = 11 +- 1.1 meV and Delta_S = 2.6 +- 0.4 meV. The BCS-ratio 2Delta_L/kTc^{local} = 5.0 - 5.9 > 3.52 (Tc^{local} is the contact area critical temperature) evidences for a strong electron-boson coupling. The results obtained agree well with our previous data by Andreev spectroscopy for single SnS-contacts.
Source:	arXiv, 1302.5326
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