Signatures of Electronic Correlations in Optical Properties of LaFeAsO${}_{1-x}$F${}_x$

A. V. Boris, N. N. Kovaleva, S. S. A. Seo +5

Spectroscopic ellipsometry is used to determine the dielectric function of the superconducting LaFeAsO${}_{0.9}$F${}_{0.1}$ ($T_c$ = 27 K) and undoped LaFeAsO polycrystalline samples i…