Optical investigations of the chemical pressurized EuFe2(As1-xPx)2: an s-wave superconductor with strong interband interaction
Abstract
Superconducting EuFe2(As0.82P0.18)2 single crystals are investigated by infrared spectroscopy in a wide frequency range. Below Tc=28K a superconducting gap forms at 20 = 9.5 meV = 3.8 kB Tc causing the reflectivity to sharply rise to unity at low frequency. In the range of the gap the optical conductivity can be perfectly described by BCS theory with an s-wave gap and no nodes. From our analysis of the temperature dependent conductivity and spectral weight at T>Tc, we deduce an increased interband coupling between hole- and electron-sheets on the Fermi surface when T approaches Tc.
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