Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 20: Poster IA (Ultrafast phenomena; Optical properties; Transport; Theory)

HL 20.11: Poster

Monday, March 16, 2015, 15:00–20:00, Poster B

Temperature dependent dielectric function of hexagonal YMnO₃ — •Steffen Richter¹, Rüdiger Schmidt-Grund¹, Carsten Bundesmann², Stefan Ebbinghaus³, and Marius Grundmann¹ — ¹Universität Leipzig, Institut für Experimentelle Physik II, Linnéstr. 5, 04103 Leipzig, Germany — ²Leibniz-Institut für Oberflächenmodifizierung e.V., Permoserstr. 15, 04318 Leipzig, Germany — ³Martin-Luther-Universität Halle-Wittenberg, Institut für Chemie, Kurt-Mothes-Str. 2, 06120 Halle, Germany

Rare earth manganites are promising due to the occurrence of multiferroic properties. Hexagonal YMnO₃ is ferrolectric up to high temperatures. Furthermore, it is antiferromagnetic below a Néel temperature of around 90K. Both features are coupled by the configuration of the manganese ions. In order to study a possible coupling to its optical properties we examine the uniaxial dielectric function of h-YMnO₃ in the NIR-VUV spectral range for temperatures from 10 to 300K. The measurements are performed at an a-plane oriented single crystal sample, grown by the optical floating zone technique. The temperature dependence of some Mn-related transitions gives hint to the occurence of a soft mode related to the antiferromagnetic phase transition.