Physics – Condensed Matter – Superconductivity
Scientific paper
2008-09-09
Phys. Rev. B 79, 012503 (2009)
Physics
Condensed Matter
Superconductivity
published version
Scientific paper
10.1103/PhysRevB.79.012503
Directional point-contact Andreev-reflection spectroscopy measurements on the Ba$_{0.55}$K$_{0.45}$Fe$_2$As$_2$ single crystals are presented. The spectra show significant differences when measured in the $ab$ plane in comparison with those measured in the $c$ direction of the crystal. In the latter case only a reduced point-contact conductance around zero bias has been revealed persisting well above $T_c$ and probably related to the structural and magnetic transitions in the system. Within the $ab$ plane two superconducting energy gaps are detected below $T_c$. Here a reduced conductance above $T_c$ could also be found. The fits of the $ab$-plane data to the superconducting s-wave two-gap model indicate that the smaller gap has a size below the BCS value while the large gap reveals much higher coupling strength.
Bud'ko Sergey L.
Canfield Paul. C.
Pribulova Z.
Pristas G.
Samuely P.
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