Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.74: Poster
Freitag, 4. April 2014, 10:30–13:30, P2
Multiferroic Ni3V2O8 measured in THz range at low temperatures and in high magnetic fields — •Malte Langenbach1, Komalavalli Thirunavukkuarasu1, Iván Cámara Mayorga2, Joachim Hemberger1, and Markus Grüninger1 — 1II. Physikalisches Institut, Universität zu Köln, Köln, Germany; — 2Max-Planck-Institut für Radioastronomie, Bonn, Germany;
THz spectroscopy in high magnetic fields is an important technique to probe materials with strong magneto-electric coupling. Here, we report on transmission measurements on the Kagomé-staircase compound Ni3V2O8. The triangle-based lattice gives rise to frustration of the short-range antiferromagnetic couplings. This causes a rich phase diagram at low temperatures [1]. Below TN=9.8 K, an incommensurate phase with collinear sinusoidal spin structure is established. This phase is followed by a cycloidal spin structure which is accompanied by the onset of ferroelectricity. Finally, below 3.9 K, the structure changes to a commensurate canted antiferromagnetic phase [2]. We report on elementary excitations in the THz range observed between 2 K and 50 K in fields up to 8 T.
Work supported by the DFG through SFB 608.
[1] M. Kenzelmann et al., Phys. Rev. B 74, 014429 (2006)
[2] G. Lawes et al., Phys. Rev. Lett. 95, 087205 (2005)