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The superconducting gap in FeAs-based superconductor SmFeAs(O 1−x F x ) (x=0.15 and 0.30) and the temperature dependence of the sample with x=0.15 have been measured by Andreev reflection spectroscopy. The intrinsic superconducting gap is independent of contacts while many other “gap-like” features vary appreciably for different contacts. The determined gap value of 2Δ=13.34±0...
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