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

TL;DR

This paper proposes using Eu,Ba)TiO$_3$ ceramics near their magnetic transition for a highly sensitive electron EDM search, showing potential for an order of magnitude improvement over current limits.

Contribution

It introduces a novel material-based approach for electron EDM detection and provides experimental data on Eu,Ba)TiO$_3$ ceramics relevant for such searches.

Findings

Eu$_{0.5}$Ba$_{0.5}$TiO$_3$ ceramics could improve EDM search sensitivity.

Measured properties support the feasibility of the proposed method.

Potential to surpass current electron EDM limits by an order of magnitude.

Abstract

We propose to use ferroelectric (Eu,Ba)TiO$_3$ 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 Eu$_{0.5}$Ba$_{0.5}$TiO$_3$ should lead to an order of magnitude improvement on the current best limit.