Field-induced linear magnetoelastic coupling in multiferroic TbMnO3

Aliouane, N.; Argyriou, D. N.; Strempfer, J.; Zegkinoglou, I.; Landsgesell, S.; Zimmermann, M. V.

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Field-induced linear magnetoelastic coupling in multiferroic TbMnO₃

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Strempfer, J.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Zegkinoglou, I.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Aliouane, N., Argyriou, D. N., Strempfer, J., Zegkinoglou, I., Landsgesell, S., & Zimmermann, M. V. (2006). Field-induced linear magnetoelastic coupling in multiferroic TbMnO₃. Physical Review B, 73(2): 020102(R).

Cite as: https://hdl.handle.net/21.11116/0000-000F-02DB-8

Abstract

We have used in-field neutron and x-ray single-crystal diffraction to
measure the incommensurability delta of the crystal and magnetic
structures of multiferroic TbMnO3. We show that the flop in the
electric polarization at the critical field H-C, for field H along the
a and b axes, coincides with a first-order transition to a commensurate
phase with propagation vector kappa= (0, 1/4,0). In- field x-ray
diffraction measurements show that the quadratic magnetoelastic
coupling breaks down with applied field as shown by the observation of
the first harmonic lattice reflections above and below H-C. This
indicates that magnetic field induces a linear magnetoelastic coupling.