Nature of the magnetic order and origin of induced ferroelectricity in TbMnO$_3$

Details Nature of the magnetic order and origin of induced ferroelectricity in TbMnO$_3$ Nature of the magnetic order and origin of induced ferroelectricity in TbMnO$_3$

2009-10-16

arxiv.org/abs/0910.3169v2

Physics

Condensed Matter

Strongly Correlated Electrons

Submitted to Physical Review Letters

Scientific paper

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 non-collinear magnetic structure, as has previously been supposed, it is shown to occur between two non-collinear structures.

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