The prospects for an electron electric dipole moment search with ferroelectric (Eu,Ba)TiO$_3$ ceramics

Abstract

We propose to use ferroelectric (Eu,Ba)TiO3 ceramics just above their magnetic ordering temperature for a sensitive electron electric dipole moment search. We have synthesized a number of such ceramics with various Eu concentrations and measured their properties relevant for such a search: permeability, magnetization noise, and ferroelectric hysteresis loops. The results of our measurements indicate that a search for the electron electric dipole moment with Eu0.5Ba0.5TiO3 should lead to an order of magnitude improvement on the current best limit.