Probing superconducting energy gap from infrared spectroscopy on a Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ single crystal with T${}_c$=37 K

G. Li, W. Z. Hu, J. Dong +5

We performed optical spectroscopy measurement on a superconducting Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ single crystal with T${}_c$=37 K. Formation of the superconducting energy gaps in t…