Study of the Two-Gap Superconductivity in GdO(F)FeAs by ScS-Andreev Spectroscopy
Abstract
Current-voltage characteristics and dynamic conductance of the superconductor - constriction - superconductor junctions in GdO(F)FeAs polycrystalline samples with critical temperatures Tclocal = 46 - 53 K were investigated. Two superconducting gaps, the large DeltaL = 10.5 +- 2 meV, and the small one DeltaS = 2.3 +- 0.4 meV were clearly observed at T = 4.2 K. The 2DeltaL/kTclocal = 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 DeltaL(T) indicates the presence of intrinsic proximity effect (in k-space) between two superconducting condensates.
Turn this paper into a lesson
ArcXiv compiles a structured reading guide from this paper's metadata: plain-English importance, contributions, prerequisite concepts, which sections to read first, flashcards, and a quiz. Grounded in the abstract, never invented.