Commensurate magnetic structures of RMn2O5 (R=Y,Ho,Bi) determined by single-crystal neutron diffraction
- Authors
- Vecchini, C.; Chapon, L. C.; Brown, P. J.; Chatterji, T.; Park, S.; Cheong, S.-W.; Radaelli, P. G.
- Issue Date
- Apr-2008
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW B, v.77, no.13
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 77
- Number
- 13
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/57340
- DOI
- 10.1103/PhysRevB.77.134434
- ISSN
- 2469-9950
2469-9969
- Abstract
- Precise magnetic structures of RMn2O5, with R=Y,Ho,Bi in the commensurate and/or ferroelectric regime, have been determined by single-crystal neutron diffraction. For each system, the integrated intensities of a large number of independent magnetic Bragg reflections have been measured, allowing unconstrained least-squares refinement of the structures. The analysis confirms the previously reported magnetic configuration in the ab plane, in particular, the existence of zigzag antiferromagnetic chains. For the Y and Ho compounds, additional weak magnetic components parallel to the c axis were detected, which are modulated in phase quadrature with the a-b components. This component is extremely small in the BiMn2O5 sample, therefore supporting symmetric exchange as the principal mechanism inducing ferroelectricity. For HoMn2O5, a magnetic ordering of the Ho moments was observed, which is consistent with a superexchange interaction through the oxygens. For all three compounds, the point symmetry in the magnetically ordered state is m2m, allowing the polar b axis found experimentally.
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