Eliashberg approach to superconductivity-induced infrared anomalies in Ba0.68K0.32Fe2As2

Abstract

We report the full complex dielectric function of high-purity ${\text{Ba}}_{0.68}{\text{K}}_{0.32}{\text{Fe}}_2{\text{As}}_2$ single crystals with $T_{\mathrm{c}}=38.5\text{K}$ determined by wide-band spectroscopic ellipsometry at temperatures $10\le T\le 300\text{K}$. We discuss the microscopic origin of superconductivity-induced infrared optical anomalies in the framework of a multiband Eliashberg theory with two distinct superconducting gap energies $2{\Delta }_{\mathrm{A}}\approx 6k_{\mathrm{B}}{T}_{\mathrm{c}}$ and $2{\Delta }_{\mathrm{B}}\approx 2.2k_{\mathrm{B}}{T}_{\mathrm{c}}$. The observed unusual suppression of the optical conductivity in the superconducting state at energies up to $14k_{\mathrm{B}}{T}_{\mathrm{c}}$ can be ascribed to spin-fluctuation--assisted processes in the clean limit of the strong-coupling regime.

4 pages, 4 figures; suppl. material: 3 pages, 2 figures, 1 interactive simulation (Fig. S3)

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