Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-11-19
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures
Scientific paper
10.1103/PhysRevB.77.174419
The field-induced multiferroic transition in TbMnO3 has been studied by neutron scattering. Apart strong hysteresis, the magnetic transition associated with the flop of electronic polarization exhibits a memory effect: after a field sweep, TbMnO3 does not exhibit the same phase as that obtained by zero-field cooling. The strong changes in the magnetic excitations across the transition perfectly agree with a rotation of the cycloidal spiral plane indicating that the inverse Dzyaloshinski-Moriya coupling causes the giant magnetoelectric effect at the field-induced transition. The analysis of the zone-center magnetic excitations identifies the electromagnon of the multiferroic high-field phase.
Aliouane Nadir
Argyriou Dimitri N.
Braden Markus
Link Peter
Senff D.
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