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- W3041256204 abstract "Magnetoelectric materials are attractive for several applications, including actuators, switches, and magnetic field sensors. Typical mechanisms for achieving a strong magnetoelectric coupling are rooted in transition metal magnetism. In sharp contrast, here we identify $mathrm{CsEr}{({mathrm{MoO}}_{4})}_{2}$ as a magnetoelectric material without magnetic transition metal ions, thus ensuring that the Er ions play a key role in achieving this interesting property. Our detailed study includes measurements of the structural, magnetic, and magnetoelectric properties of this material. Bulk characterization and neutron powder diffraction show no evidence for structural phase transitions down to 0.3 K and therefore $mathrm{CsEr}{({mathrm{MoO}}_{4})}_{2}$ maintains the room temperature $P2/c$ space group over a wide temperature range without external magnetic field. These same measurements also identify collinear antiferromagnetic ordering of the ${mathrm{Er}}^{3+}$ moments below ${T}_{N}=0.87phantom{rule{4pt}{0ex}}mathrm{K}$. Complementary dielectric constant and pyroelectric current measurements reveal that a ferroelectric phase with a maximum polarization $Pensuremath{sim}0.6phantom{rule{4pt}{0ex}}mathrm{nC}/{mathrm{cm}}^{2}$ emerges when applying a modest external magnetic field, which indicates that this material has a strong magnetoelectric coupling. We argue that the magnetoelectric coupling in this system arises from a pseudo Jahn-Teller distortion induced by the magnetic field." @default.
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- W3041256204 date "2020-09-28" @default.
- W3041256204 modified "2023-10-14" @default.
- W3041256204 title "Magnetoelectric effect arising from a field-induced pseudo Jahn-Teller distortion in a rare-earth magnet" @default.
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- W3041256204 doi "https://doi.org/10.1103/physrevmaterials.4.094411" @default.
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