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MA: Fachverband Magnetismus

MA 52: Poster II

MA 52.69: Poster

Thursday, March 15, 2018, 15:00–18:00, Poster C

THz spectroscopy on chiral Ni₃TeO₆ in magnetic fields up to 8 T — •David Maluski¹, Malte Langenbach¹, David Szaller², István Kézsmárki³, Joachim Hemberger¹, and Markus Grüninger¹ — ¹II. Physikalisches Institut, Universität zu Köln — ²Institut für Festkörperphysik, Technische Universität Wien — ³Experimentalphysik V, Universität Augsburg

In the realm of multiferroicity, Ni₃TeO₆ stands out for the observation of non-hysteretic magnetic switching and the record linear magnetoelectric coupling constant in single-phase materials [1]. The structure of Ni₃TeO₆ is both chiral and polar already at room temperature. The antiferromagnetically ordered phase below T_N = 53 K features collinear ordered moments and a significantly enhanced electric polarization due to magneto-electric coupling [1]. In an external magnetic field, chiral structures show both natural optical activity as well as magnetic optical activity (Faraday effect). However, one may also expect more exotic effects such as magneto chiral dichroism or quadrochroism [2]. Circularly polarised light is particularly well suited to address such effects. We study the optical properties of Ni₃TeO₆ in the THz range using circularly polarised light, high magnetic fields, and low temperatures.
Y. S. Oh et al., Nat. Commun. 5:3201 (2014)
I. Kézsmárki et al., Nat. Commun. 5:3203 (2014)