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 2Δ_{0} = 9.5 meV = 3.8 k_B T_c 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>T_c, we deduce an increased interband coupling between hole- and electron-sheets on the Fermi surface when $T$ approaches T_c.

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Cited by in corpus (10)

• Infrared Measurement of the Pseudogap in P-Doped and Co-Doped BaFe2As2 High-Temperature Superconductors
• Thermopower as sensitive probe of electronic nematicity in iron pnictides
• Signatures of quantum criticality in hole-doped and chemically pressurized EuFe_2As_2 single crystals
• Spin-density-wave-induced anomalies in the optical conductivity of AFe2As2, (A=Ca, Sr, Ba) single-crystalline iron pnictides
• Topological magnetic order and superconductivity in EuRbFe${}_4$As${}_4$
• Electron spin resonance in Eu based Fe pnictides
• Optical properties of superconducting EuFe2(As1-xPx)2
• Electronic Scattering Effects in Europium-Based Iron Pnictides
• Optical Study of BaFe${}_2$As${}_2$ under pressure: Coexistence of spin-density-wave gap and superconductivity
• Competing ferromagnetic superconducting states in europium-based iron pnictides