Ghara, Somnath ; Suard, Emmanuelle ; Fauth, François ; Tran, T. Thao ; Halasyamani, P. Shiv ; Iyo, Akira ; Rodríguez-Carvajal, Juan ; Sundaresan, A. (2017) Ordered aeschynite-type polar magnets RFeWO6 ( R=Dy , Eu, Tb, and Y): A new family of type-II multiferroics Physical Review B: Condensed Matter and Materials Physics, 95 (22). ISSN 2469-9950
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Official URL: http://doi.org/10.1103/PhysRevB.95.224416
Related URL: http://dx.doi.org/10.1103/PhysRevB.95.224416
Abstract
We report the discovery of magnetoelectric multiferroicity in a family of oxides, RFeWO6(R = Dy , Eu, Tb, and Y) that crystallize in a polar aeschynite-type structure (Pna21) with an ordered arrangement of Fe3+ and W6+ ions. Magnetization and analysis of neutron-diffraction data of DyFeWO6 reveal a commensurate noncollinear antiferromagnetic ordering of Fe3+ spins (TFeN∼18 K ), which induce Dy spins to order at the same temperature. A sudden change in electric polarization (Δ P) appears in all the compounds at T Fe N = 15–18 K . The electric polarization is sensitive to an applied magnetic field, and the coupling between different magnetic R -ion and Fe-ion moments suppresses the polarization to a different extent. Although the measured polarization in polycrystalline DyFeWO6 at 3.5 K is about 3μC/m2, a simple calculation of the ionic contribution to polarization with formal charges is 75 560 μC/m2 and it is of the form P = ( px,0,pz) where, p x comes from magnetic ordering and p z is associated with the polar structure in the paramagnetic state. These findings open up an avenue to explore further new polar magnets with rare-earth/transition-metal ions in the ordered aeschynite-type structure.
Item Type: | Article |
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Source: | Copyright of this article belongs to American Physical Society. |
ID Code: | 119992 |
Deposited On: | 21 Jun 2021 07:35 |
Last Modified: | 21 Sep 2021 10:10 |
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