Electromagnons in multiferroic RMn2O5 compounds and their microscopic origin

Details Electromagnons in multiferroic RMn2O5 compounds and their microscopic origin Electromagnons in multiferroic RMn2O5 compounds and their microscopic origin

2008-06-06

arxiv.org/abs/0806.1207v1

Physics

Condensed Matter

Materials Science

20 pages, 9 figures, to be published in J. Phys.: Condens. Matter, special issue on multiferroics

Scientific paper

10.1088/0953-8984/20/43/434210

We summarize the existing experimental data on electromagnons in multiferroic RMn2O5 compounds, where R denotes a rare earth ion, Y or Bi, and discuss a realistic microscopic model of these materials based on assumption that the microscopic mechanism of magnetically-induced ferroelectricity and electromagnon absorption relies entirely on the isotropic Heisenberg exchange and magnetostrictive coupling of spins to a polar lattice mode and does not involve relativistic effects. This model explains many magnetic and optical properties of RMn2O5 manganites, such as the spin re-orientation transition, magnetically-induced polarisation, appearance of the electromagnon peak in the non-collinear spin state and the polarisation of light for which this peak is observed. We compare experimental and theoretical results on electromagnons in RMn2O5 and RMnO3 compounds.

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