Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

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.
A.Pimenov et al., Nature Phys., 2, 97(2006).
A.Pimenov et al., Phys. Rev. B, 77, 014438(2008).
N.Kida et al., Phys. Rev. B, 78, 104414(2008).
R.Valdés Aguilar et al., Phys. Rev. Lett., 102, 047203(2009).