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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 TlocalC = 46 ÷ 53 K were investigated. Two superconducting gaps, the large ΔL 10.5±2 meV, and the small one Δs 2.3 ±...
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Published in: | Journal of physics. Conference series 2012-01, Vol.391 (1), p.12138-7 |
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Main Authors: | , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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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 TlocalC = 46 ÷ 53 K were investigated. Two superconducting gaps, the large ΔL 10.5±2 meV, and the small one Δs 2.3 ± 0.4 meV were clearly observed at T = 4.2 K. The 2ΔL/kBTlocalC 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 ΔL(T) indicates the presence of intrinsic proximity effect (in κ-space) between two superconducting condensates. |
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ISSN: | 1742-6588 1742-6596 |
DOI: | 10.1088/1742-6596/391/1/012138 |