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Far-infrared optical excitations in multiferroic TbMnO3

  • Topical issue on Magnetoelectric Interaction Phenomena in Crystals
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Abstract

We provide a detailed study of the reflectivity of multiferroic TbMnO3 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, dam** 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.

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Authors and Affiliations

  1. Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135, Augsburg, Germany

    M. Schmidt, Ch. Kant, T. Rudolf, F. Mayr, J. Deisenhofer & A. Loidl

  2. General Physics Institute of the Russian Academy of Sciences, 119991, Moscow, Russia

    A. A. Mukhin

  3. Moscow Power Engineering Institute, 105835, Moscow, Russia

    A. M. Balbashov

Authors
  1. M. Schmidt
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  2. Ch. Kant
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  3. T. Rudolf
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  4. F. Mayr
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  5. A. A. Mukhin
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  6. A. M. Balbashov
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  7. J. Deisenhofer
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  8. A. Loidl
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Correspondence to M. Schmidt.

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Schmidt, M., Kant, C., Rudolf, T. et al. Far-infrared optical excitations in multiferroic TbMnO3 . Eur. Phys. J. B 71, 411–418 (2009). https://doi.org/10.1140/epjb/e2009-00215-3

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