Coupling of frustrated Ising spins to magnetic cycloid in multiferroic TbMnO3

Details Coupling of frustrated Ising spins to magnetic cycloid in multiferroic TbMnO3 Coupling of frustrated Ising spins to magnetic cycloid in multiferroic TbMnO3

2007-08-16

arxiv.org/abs/0708.2226v1

Phys. Rev. Lett. 99, 177206 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.99.177206

We report on diffraction measurements on multiferroic TbMnO3 which demonstrate that the Tb- and Mn-magnetic orders are coupled below the ferroelectric transition TFE = 28 K. For T < TFE the magnetic propagation vectors (tau) for Tb and Mn are locked so that tauTb = tauMn, while below TNTb = 7 K we find that tauTb and tauMn lock-in to rational values of 3/7 b* and 2/7 b*, respectively, and obey the relation 3tauTb - tauMn = 1. We explain this novel matching of wave vectors within the frustrated ANNNI model coupled to a periodic external field produced by the Mn-spin order. The tauTb = tauMn behavior is recovered when Tb magnetization is small, while the tauTb = 3/7 regime is stabilized at low temperatures by a peculiar arrangement of domain walls in the ordered state of Ising-like Tb spins.

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