Evidence of electro-active excitation of the spin cycloid in TbMnO3

Details Evidence of electro-active excitation of the spin cycloid in TbMnO3 Evidence of electro-active excitation of the spin cycloid in TbMnO3

2010-01-07

arxiv.org/abs/1001.1148v1

Phys. Rev. Lett. 104, 097202 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages

Scientific paper

10.1103/PhysRevLett.104.097202

Terahertz electromagnetic excitations in the multiferroic TbMnO3 at the field-induced magnetic transition are investigated for different orientations of the magnetic cycloid. In addition to the electromagnon along the a-axis, the detailed polarization analysis of the experimental spectra suggests the existence of an electro-active excitation for ac electric fields along the crystallographic c-axis. This excitation is possibly the electro-active eigenmode of the spin cycloid in TbMnO3, which has been predicted within the inverse Dzyaloshinskii-Moriya mechanism of magnetoelectric coupling.

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