Study of the Two-Gap Superconductivity in GdO(F)FeAs by ScS-Andreev Spectroscopyстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация: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 Δ_L = 10.5 ± 2 meV, and the small one Δ_S = 2.3 ± 0.4 meV were clearly observed at T = 4.2 K. The 2Δ_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 Δ_L(T) indicates the presence of intrinsic proximity effect (in k-space) between two superconducting condensates.