Optical Properties of Iron-Selenide Na${}_{0.27}$K${}_{0.27}$Rb${}_{0.27}$Fe${}_{1.7}$Se${}_2$ Single Crystals

Andrei Muratov, Yevgeny Rakhmanov, Andrei Shilov +2

With infrared Fourier-transform spectroscopy and spectroscopic ellipsometry we investigated the in-plane reflectance of the superconducting Na${}_{0.27}$K${}_{0.27}$Rb${}_{0.27}$Fe$_{1.7…