Details

Autor(en) / Beteiligte

• Kuzmicheva, T. E.
• Kuzmichev, S. A.
• Mikheev, M. G.
• Ponomarev, Ya. G.
• Tchesnokov, S. N.
• Eltsev, Yu. F.
• Pudalov, V. M.
• Pervakov, K. S.
• Sadakov, A. V.
• Usoltsev, A. S.
• Khlybov, E. P.
• Kulikova, L. F.

Titel

Experimental study of the intrinsic multiple Andreev reflections effect in GdO(F)FeAs superconductor array junctions

Ist Teil von

• Europhysics letters, 2013-06, Vol.102 (6), p.67006

Ort / Verlag

Les Ulis: EDP Sciences, IOP Publishing and Società Italiana di Fisica

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 a "break-junction" technique in the GdO(F)FeAs superconductor (TC = (48-53) K). We show that superconducting gap peculiarities in dI dV spectra sharpen dramatically in the arrays as compared with that in the single-contact spectra; this enables to improve significantly the accuracy of the bulk superconducting parameters determination. By using IMARE, we determined the large- and the small-gap values ΔL = 11.0 ± 1.1 meV and ΔS = 2.6 ± 0.4 meV. The BCS ratio 2ΔL kBTClocal = 5.0-5.9 > 3.52 (TClocal is the contact area critical temperature) evidences a strong electron-boson coupling. The results obtained agree well with our previous data by Andreev spectroscopy for single SnS contacts.