Phys. Rev. Lett. 98, 057206 (2007) [4 pages]Enhanced Ferroelectric Polarization by Induced Dy Spin Order in Multiferroic DyMnO3Received 3 September 2006; published 1 February 2007 Neutron powder diffraction and single crystal x-ray resonant magnetic scattering measurements suggest that Dy plays an active role in enhancing the ferroelectric polarization in multiferroic DyMnO3 above TNDy=6.5 K. We observe the evolution of an incommensurate ordering of Dy moments with the same periodicity as the Mn spiral ordering. It closely tracks the evolution of the ferroelectric polarization. Below TNDy, where Dy spins order commensurately, the polarization decreases to values similar for those of TbMnO3. The higher Ps found just above TNDy arises from the contribution of Dy spins so as to effectively increase the amplitude of the Mn spin spiral. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.057206
DOI:
10.1103/PhysRevLett.98.057206
PACS:
75.30.Kz, 61.10.−i, 61.12.Ld, 77.80.Fm
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