2008/06/06 by A B Sushkov, A. B. Sushkov, M. Mostovoy +7
Materials Science · Physics and Astronomy · #Ferroelectric and Piezoelectric Materials #Ferroelectricity #Heisenberg model #Isotropy #Lattice (music) #Magnetic and transport properties of perovskites and related materials #Magnetization #Multiferroics #Multiferroics and related materials #Polar #Polarization (electrochemistry) #Spins #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1088/0953-8984/20/43/434210
20 pages, 9 figures, to be published in J. Phys.: Condens. Matter, special issue on multiferroics
arxiv created 2008/06/06 · openalex publication_date 2008/10/09 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We summarize the existing experimental data on electromagnons in multiferroic RMn 2 O 5 compounds, where R denotes a rare earth ion, Y or Bi, and discuss a realistic microscopic model of these materials based on the 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 RMn 2 O 5 manganites, such as the spin re-orientation transition, magnetically induced polarization, appearance of the electromagnon peak in the non-collinear spin state and the polarization of light for which this peak is observed. We compare experimental and theoretical results on electromagnons in RMn 2 O 5 and RMnO 3 compounds.