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Nature of the Magnetic Order and Origin of Induced Ferroelectricity in TbMnO3

Wilkins, SB; Forrest, TR; Beale, TAW; Bland, SR; Walker, HC; Mannix, D; Yakhou, F; ... McMorrow, DF; + view all (2009) Nature of the Magnetic Order and Origin of Induced Ferroelectricity in TbMnO3. PHYS REV LETT , 103 (20) , Article 207602. 10.1103/PhysRevLett.103.207602. Green open access

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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.

Type: Article
Title: Nature of the Magnetic Order and Origin of Induced Ferroelectricity in TbMnO3
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.103.207602
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.103.207602
Language: English
Additional information: © 2009 The American Physical Society
Keywords: EXCHANGE SCATTERING, POLARIZATION
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/126599
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