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Multiferroic properties and magnetic structure of Sm_{1-x}Y_{x}MnO_{3}
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O’Flynn, Daniel, Tomy, C. V., Lees, Martin R., Daoud-Aladine, A. and Balakrishnan, Geetha (2011) Multiferroic properties and magnetic structure of Sm_{1-x}Y_{x}MnO_{3}. Physical Review B (Condensed Matter and Materials Physics), Volume 83 (Number 17). article no.174426 . doi:10.1103/PhysRevB.83.174426 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.83.174426
Abstract
We have successfully induced multiferroic behavior in the A-type antiferromagnet SmMnO(3) by the substitution of Y at the Sm site. A magnetic transition develops at similar to 24 K for Sm(1-x)Y(x)MnO(3) (x = 0.4, 0.5) which is not present in the parent compound. This transition coincides with the onset of electric order, with an electric polarization measured along the c axis. It is proposed that the effect of Y doping is to bring about a subtle distortion of the MnO(6) octahedra, causing a magnetic ordering of the Mn(3+) moments similar to that reported for the well-studied multiferroic TbMnO(3). Following on from our previous study on polycrystalline samples, we present measurements of the magnetic and electric properties of single-crystal Sm(0.6)Y(0.4)MnO(3) and Sm(0.5)Y(0.5)MnO(3). The data are summarized in a phase diagram for each of the principal crystallographic axes for the x = 0.5 compound. Powder neutron diffraction experiments on SmMnO(3) and Sm(0.6)Y(0.4)MnO(3) show that the Y substitution causes a change in the Mn-O-Mn bond angle toward the value found for TbMnO(3). The magnetic structure of Sm(0.6)Y(0.4)MnO(3) has been shown to consist of two phases: a sinusoidal ordering of the Mn(3+) moments below 50 K and a cycloidal ordering below 27 K. The cycloidal ordering occurs at the same temperature as the previously observed ferroelectric polarization, suggesting a similar multiferroic mechanism to that found in TbMnO(3).
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Magnetic structure, Ferromagnetic materials, Phase transformations (Statistical physics), Neutrons -- Diffraction | ||||
| Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||
| Publisher: | American Physical Society | ||||
| ISSN: | 1098-0121 | ||||
| Official Date: | 2011 | ||||
| Dates: |
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| Volume: | Volume 83 | ||||
| Number: | Number 17 | ||||
| Page Range: | article no.174426 | ||||
| DOI: | 10.1103/PhysRevB.83.174426 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC), Advantage West Midlands (AWM) , European Regional Development Fund (ERDF) |
Data sourced from Thomson Reuters' Web of Knowledge
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