Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-05-18
Eur. Phys. J. B 71, 411-418 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 7 figures, accepted for submission in European Physical Journal B
Scientific paper
10.1140/epjb/e2009-00215-3
We provide a detailed study of the reflectivity of multiferroic TbMnO_3 for wave numbers from 40 cm^{-1} to 1000 cm^{-1} and temperatures 5 K < T < 300 K. Excitations are studied for polarization directions E || a, the polarization where electromagnons are observed, and for E || c, the direction of the spontaneous polarization in this material. The temperature dependencies of eigenfrequencies, damping constants and polar strengths of all modes are studied and analyzed. For E || a and below the spiral ordering temperature of about 27 K we observe a transfer of optical weight from phonon excitations to electromagnons, which mainly involves low-frequency phonons. For E || c an unusual increase of the total polar strength and hence of the dielectric constant is observed indicating significant transfer of dynamic charge probably within manganese-oxygen bonds on decreasing temperatures.
Balbashov A. M.
Deisenhofer Joachim
Kant Ch.
Loidl Alois
Mayr Franz
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