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VOLUME 104 (2016) | ISSUE 12 | PAGE 864
Direct Evidence of Two Superconducting Gaps in FeSe0.5Te0.5: SnS-Andreev Spectroscopy and Lower Critical Field
Abstract
We present direct measurements of the superconducting order parameter in nearly optimal FeSe0.5Te0.5 single crystals with critical temperature T_C \approx 14 K. Using intrinsic multiple Andreev reflection effect (IMARE) spectroscopy and measurements of lower critical field, we directly determined two superconducting gaps, \Delta_L \approx 3.3{-}3.4 meV and \Delta_S \approx 1 meV, and their temperature dependences. We show that a two-band model fits well the experimental data. The estimated electron-boson coupling constants indicate a strong intraband and a moderate interband interaction.