Physics – Condensed Matter – Superconductivity
Scientific paper
2008-12-05
Physical Review B 80, 060502(R) (2009)
Physics
Condensed Matter
Superconductivity
4 pages, 4 eps color figures
Scientific paper
10.1103/PhysRevB.80.060502
Point-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.
Daghero Dario
Gonnelli Renato S.
Karpinski Janusz
Stepanov Alexander V.
Tortello M.
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