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24 October 2021
  » arxiv » 0812.1141

 Article overview

Evidence for two-gap nodeless superconductivity in SmFeAsO$_{0.8}$F$_{0.2}$ from point-contact Andreev-reflection spectroscopy
D. Daghero ; M. Tortello ; R.S. Gonnelli ; V.A. Stepanov ; N.D. Zhigadlo ; J. Karpinski ;
Date 5 Dec 2008
AbstractPoint-contact Andreev-reflection measurements were performed in SmFeAsO_{0.8}F_{0.2} polycrystals with T_c simeq 53 K. The experimental conductance curves reproducibly exhibit peaks around pm 6 mV and shoulders at V sim 16-20 mV, indicating the presence of two nodeless superconducting gaps. While the single-band Blonder-Tinkham-Klapwijk fit can only reproduce a small central portion of the conductance curve, the two-gap one accounts remarkably well for the shape of the whole experimental dI/dV. The fits of the normalized curves give Delta_1(0) = 6.15 pm 0.45 meV and Delta_2(0) = 18 pm 3 meV. Both gaps close at the same temperature and follow a BCS-like behavior.
Source arXiv, 0812.1141
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