Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 14: Matter At Low Temperature: Multiferroics (jointly with MA, DF, DS, KR

TT 14.4: Vortrag

Montag, 26. März 2012, 17:45–18:00, H 3005

Infrared and THz spectroscopy in multiferroic Eu_1−xHo_xMnO₃ — •Zhenyu Chen¹, Michael Schmidt¹, Franz Mayr¹, Zhe Wang¹, A.A. Mukhin², Joachim Deisenhofer¹, and Alois Loidl¹ — ¹Experimentalphysik V, EKM, University of Augsburg, 86135 Augsburg, Germany — ²General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia

We investigated Eu_1−xHo_xMnO₃ with the concentration varying from 0.1 to 0.5. On cooling, Eu_0.9Ho_0.1MnO₃ enters an incommensurate antiferromagnetic phase, which turns into an commensurate antiferromagnetic one at lower temperatures. Doping leads to ferroelectricity with polarization parallel to the a-axis, which flips to P//c by further doping. In order to detect the coupling between low energy phonons and electromagnons [1-4], we performed systematic polarization dependent IR and THz studies. The data will be compared to TbMnO₃ and the related system Eu_1−xY_xMnO₃.
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