DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2014 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.74: Poster

Friday, April 4, 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 Grüninger11II. 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)

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2014 > Dresden