Physics – Condensed Matter – Superconductivity
Scientific paper
2011-03-04
Phys. Rev. B 84, 174511 (2011)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures; suppl. material: 3 pages, 2 figures, 1 interactive simulation (Fig. S3)
Scientific paper
10.1103/PhysRevB.84.174511
We report the full complex dielectric function of high-purity $\textrm{Ba}_{0.68}\textrm{K}_{0.32}\textrm{Fe}_2\textrm{As}_2$ single crystals with $T_{\mathrm{c}}=38.5\ \textrm{K}$ determined by wide-band spectroscopic ellipsometry at temperatures $10\leq T\leq300\ \textrm{K}$. 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 $2\Delta_{\mathrm{A}}\approx6\ k_{\mathrm{B}}T_{\mathrm{c}}$ and $2\Delta_{\mathrm{B}}\approx2.2\ k_{\mathrm{B}}T_{\mathrm{c}}$. The observed unusual suppression of the optical conductivity in the superconducting state at energies up to $14\ k_{\mathrm{B}}T_{\mathrm{c}}$ can be ascribed to spin-fluctuation--assisted processes in the clean limit of the strong-coupling regime.
Boris A. V.
Charnukha A.
Dolgov Oleg V.
Golubov Alexander A.
Keimer Bernhard
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