title: Nature of the magnetic order and origin of induced ferroelectricity in TbMnO3.
abstract: The magnetic structures which endow TbMnO(3) 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.
authors.affiliation: Department of Condensed Matter Physics and Materials Science, Brookhaven National Lab, Upton, New York 11973-5000, USA.
authors.forename: S B
authors.initials: SB
authors.lastname: Wilkins
authors.forename: T R
authors.initials: TR
authors.lastname: Forrest
authors.forename: T A W
authors.initials: TA
authors.lastname: Beale
authors.forename: S R
authors.initials: SR
authors.lastname: Bland
authors.forename: H C
authors.initials: HC
authors.lastname: Walker
authors.forename: D
authors.initials: D
authors.lastname: Mannix
authors.forename: F
authors.initials: F
authors.lastname: Yakhou
authors.forename: D
authors.initials: D
authors.lastname: Prabhakaran
authors.forename: A T
authors.initials: AT
authors.lastname: Boothroyd
authors.forename: J P
authors.initials: JP
authors.lastname: Hill
authors.forename: P D
authors.initials: PD
authors.lastname: Hatton
authors.forename: D F
authors.initials: DF
authors.lastname: McMorrow