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VOLUME 93 (2011) | ISSUE 2 | PAGE 95
Observation of Multi-Gap Superconductivity in GdO(F)FeAs by Andreev Spectroscopy
Abstract
We have studied current-voltage characteristics of Andreev contacts in polycrystalline GdO0.88F0.12FeAs samples with bulk critical temperature Tc = (52.5 \pm 1) K using break-junction technique. The data obtained cannot be described within the single-gap approach and suggests the existence of a multi-gap superconductivity in this compound. The large and small superconducting gap values estimated at T = 4.2 K are \Delta_L\hm = 10.5\pm 2 meV and ΔS = 2.3 \pm 0.4 meV, respectively.