Nanoscale phase separation of antiferromagnetic order and superconductivity in K${}_{0.75}$Fe${}_{1.75}$Se${}_2$

R. H. Yuan, T. Dong, Y. J. Song +5

We report an in-plane optical spectroscopy study on the iron-selenide superconductor K${}_{0.75}$Fe${}_{1.75}$Se${}_2$. The measurement revealed the development of a sharp reflectance ed…