A multiferroic material to search for the permanent electric dipole moment of the electron


We suggested using strong internal electric field in multiferroic Eu0.5Ba0.5TiO3 for the search of permanent electric dipole moment (EDM) of the electron. According to standard model of particles its value should be of order of 10–40 e.cm. Recently it has been shown that spontaneous violation of charge parity symmetry is much larger then it follows from the standard model, therefore this model needs an extension. New particle theories propose EDM of electrons 8 or 12 orders of magnitude larger then the standard model. The physicists try to measure EDM of electron already 40 years, unfortunately fruitlessly. They reached sensitivity of only 10–27 e.cm. We have shown that in multiferroic Eu0.5Ba0.5TiO3 the sensitivity should be one order of magnitude higher. In case of successful determination of EDM value it will be possible to prove and specify new theories going beyond the standard model. We synthesized this material, prepared ceramic samples suitable for this EDM measurement and characterized its magnetic and dielectric properties. Theory has been done by our foreign partners.

Temperature dependence of ac magnetic susceptibility, χ, at various static magnetic fields and a frequency of 214 Hz. The inset shows magnetization curves at various temperatures. We note that no hysteresis in magnetization was observed.