Electrodynamics of Nearly-Ferroelectric Superconductors

Joseph L. Birman, Natalya A. Zimbovskaya

We report here the frequency-dependent optical response of a nearly ferroelectric superconductor (NFE-SC), like Na${}_x$WO${}_3$, or n-SrTiO${}_3$. From $\omega =0$, up to a critical frequen…