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- W2086877182 abstract "Directional point-contact Andreev-reflection spectroscopy measurements on the ${text{Ba}}_{0.55}{text{K}}_{0.45}{text{Fe}}_{2}{text{As}}_{2}$ 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." @default.
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- W2086877182 date "2009-01-16" @default.
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- W2086877182 title "Evidence for two-gap superconductivity in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>Ba</mml:mtext></mml:mrow><mml:mrow><mml:mn>0.55</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mtext>K</mml:mtext><mml:mrow><mml:mn>0.45</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Fe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>As</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:…" @default.
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- W2086877182 doi "https://doi.org/10.1103/physrevb.79.012503" @default.
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