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Publication Detail
Nature of the Magnetic Order and Origin of Induced Ferroelectricity in TbMnO3
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Wilkins SB, Forrest TR, Beale TAW, Bland SR, Walker HC, Mannix D, Yakhou F, Prabhakaran D, Boothroyd AT, Hill JP, Hatton PD, McMorrow DF
  • Publisher:
    AMER PHYSICAL SOC
  • Publication date:
    13/11/2009
  • Journal:
    PHYS REV LETT
  • Volume:
    103
  • Issue:
    20
  • Article number:
    207602
  • Print ISSN:
    0031-9007
  • Language:
    EN
  • Keywords:
    EXCHANGE SCATTERING, POLARIZATION
  • Addresses:
    Wilkins, SB
    Brookhaven Natl Lab
    Dept Condensed Matter Phys & Mat Sci
    Upton
    NY
    11973
    USA
Abstract
The magnetic structures which endow TbMnO3 with its multiferroic properties have been reassessed on the basis of a comprehensive soft x-ray resonant scattering (XRS) study. The selectivity of XRS facilitated separation of the various contributions (Mn L-2 edge, Mn 3d moments; Tb M-4 edge, Tb 4f moments), while its variation with azimuth provided information on the moment direction of distinct Fourier components. When the data are combined with a detailed group theory analysis, a new picture emerges of the ferroelectric transition at 28 K. Instead of being driven by the transition from a collinear to a noncollinear magnetic structure, as has previously been supposed, it is shown to occur between two noncollinear structures.
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