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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 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.

preprint2012arXivOpen access
T. E. ShanyginaYa. G. PonomarevS. A. KuzmichevM. G. MikheevS. N. TchesnokovO. E. Omel'yanovskyA. V. SadakovYu. F. EltsevV. M. PudalovA. S. Usol'tsevE. P. KhlybovL. F. Kulikova
cond-mat.supr-con
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Open access12 authors1 topic
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T. E. ShanyginaYa. G. PonomarevS. A. KuzmichevM. G. MikheevS. N. TchesnokovO. E. Omel'yanovskyA. V. SadakovYu. F. EltsevV. M. PudalovA. S. Usol'tsevE. P. KhlybovL. F. Kulikova

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