Study of the Two-Gap Superconductivity in GdO(F)FeAs by ScS-Andreev Spectroscopy

Current-voltage characteristics and dynamic conductance of the superconductor - constriction - superconductor junctions in GdO(F)FeAs polycrystalline samples with critical temperatures Tc^local = 46 - 53 K were investigated. Two superconducting gaps, the large Delta_L = 10.5 +- 2 meV, and the small...

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Published inarXiv.org
Main Authors Shanygina, T E, Ponomarev, Ya G, Kuzmichev, S A, Mikheev, M G, Tchesnokov, S N, Omel'yanovsky, O E, Sadakov, A V, Eltsev, Yu F, Pudalov, V M, Usol'tsev, A S, Khlybov, E P, Kulikova, L F
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 18.05.2012
Subjects
Current voltage characteristics
Physics - Superconductivity
Proximity effect (electricity)
Resistance
Superconductivity
Superconductor junctions
Temperature dependence
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Summary:Current-voltage characteristics and dynamic conductance of the superconductor - constriction - superconductor junctions in GdO(F)FeAs polycrystalline samples with critical temperatures Tc^local = 46 - 53 K were investigated. Two superconducting gaps, the large Delta_L = 10.5 +- 2 meV, and the small one Delta_S = 2.3 +- 0.4 meV were clearly observed at T = 4.2 K. The 2Delta_L/kTc^local = 5.5 +- 1 ratio gives support to the strong coupling mechanism which is responsible for the high Tc value. Temperature dependence of the large gap Delta_L(T) indicates the presence of intrinsic proximity effect (in k-space) between two superconducting condensates.
ISSN:2331-8422
DOI:10.48550/arxiv.1205.4125