How Electrons Become Mobile in a Colossal Dielectric -- Fe${}_2$TiO${}_5$

M. L. McLanahan, A. P. Ramirez

We measure the colossal permittivity in single crystal Fe${}_2$TiO${}_5$ using broadband spectroscopy in the frequency range 20 Hz - 1 MHz. The relaxation response is analyzed using a…