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Ponomarev","submitted_at":"2013-02-21T16:11:38Z","abstract_excerpt":"Using the \"break-junction\" technique we prepared and studied superconductor - constriction - superconductor nanocontacts in polycrystalline samples of Fe-based superconductors CeO$_{0.88}$F$_{0.12}$FeAs (Ce-1111; $T_C^{\\rm bulk} = 41 \\pm 1 K$), LaO$_{0.9}$F$_{0.1}$FeAs (La-1111; $T_C^{\\rm bulk} = 28 \\pm 1 K$), and FeSe ($T_C^{\\rm bulk} = 12 \\pm 1 K$). We detected two subharmonic gap structures related with multiple Andreev reflections, indicating the presence of two superconducting gaps with the BCS-ratios $2\\Delta_L/k_BT_C = 4.2 \\div 5.9$ and $2\\Delta_S/k_BT_C\\sim 1 \\ll 3.52$, respectively. 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