Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 51: Magnetism Poster B
MA 51.39: Poster
Donnerstag, 4. April 2019, 15:00–18:00, Poster C
Non-reciprocal THz response of chiral Ni3TeO6 in magnetic field — •David Maluski1, Malte Langenbach1, David Szaller2, István Kézsmárki3, Vladimir Tsurkan3, Sang-Wook Cheong4, Joachim Hemberger1, and Markus Grüninger1 — 1II. Physikalisches Institut, Universität zu Köln — 2Institut für Festkörperphysik, Technische Universität Wien — 3Experimentalphysik V, Universität Augsburg — 4Department of Physics and Astronomy Rutgers, The State University of New Jersey
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 TN = 53K 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 non-reciprocal effects such as magneto-chiral dichroism or quadrochroism [2]. We use circularly polarised light in the THz range and high magnetic fields to prove the existence of this effect in Ni3TeO6 at low temperatures.
[1] Y. S. Oh et al., Nat. Commun. 5:3201 (2014) [2] I. Kézsmárki et al., Nat. Commun. 5:3203 (2014)