Optical investigations of chemically pressurized EuFe2(As1−xPx)2: An s-wave superconductor with strong interband interactions

D. Wu; G. Chanda; H. S. Jeevan; P. Gegenwart; M. Dressel

doi:10.1103/PhysRevB.83.100503

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Optical investigations of chemically pressurized EuFe2(As1−xPx)2: An s-wave superconductor with strong interband interactions

D. Wu, G. Chanda, H. S. Jeevan, P. Gegenwart, M. Dressel

DOI 10.1103/PhysRevB.83.100503 · Physical Review B

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Abstract

Superconducting EuFe2(As0.82P0.18)2 single crystals are investigated by broad-band infrared spectroscopy. Below Tc=28 K, a superconducting gap forms at 2Δ0=9.5 meV=3.7kBTc, 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
EuFe2(As0.82P0.18)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	28	Pressure not reported	unknown
EuFe2(As0.82P0.18)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	28	Pressure not reported	unknown
Ba0.6K0.4Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	38	Pressure not reported	unknown