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Magnetoelectric materials are attractive for several applications, includingactuators, switches, and magnetic field sensors. Typical mechanisms forachieving a strong magnetoelectric coupling are rooted in transition metalmagnetism. In sharp contrast, here we identify CsEr(MoO4)2 as a magnetoelectricmaterial without magnetic transition metal ions, thus ensuring that the Er ionsplay a key role in achieving this interesting property. Our detailed studyincludes measurements of the structural, magnetic, and electric properties ofthis material. Bulk characterization and neutron powder diffraction show noevidence for structural phase transitions down to 0.3 K and thereforeCsEr(MoO4)2 maintains the room temperature P2/c space group over a widetemperature range without external magnetic field. These same measurements alsoidentify collinear antiferromagnetic ordering of the Er3+ moments below TN =0.87 K. Complementary dielectric constant and pyroelectric current measurementsreveal that a ferroelectric phase (P ~ 0.5 nC/cm2) emerges when applying amodest external magnetic field, which indicates that this material has a strongmagnetoelectric coupling. We argue that the magnetoelectric coupling in thissystem arises from a pseudo Jahn-Teller distortion induced by the magneticfield.

Magnetoelectric effect arising from a field-induced pseudo Jahn-Teller distortion in a rare earth magnet