Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 17: Poster Session I
MA 17.89: Poster
Dienstag, 8. März 2016, 09:30–12:30, Poster B1
Analysing the electronic behavior of HoMn2O5 with spectroscopic Ellipsometry — Paul J. Graham1, •Bastian Besner2, Gerd Neuber2, Shirly J. Espinoza-Herrera3, Michael A. Rübhausen2, and Clemens Ulrich1 — 1School of Physics and School of Materials Science and Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia — 2Institut für Nanostruktur- und Festkörperforschung, Center for Free-Electron Laser Science, Advanced Study Group APOG, University of Hamburg, Luruper Chaussee 149, 22761 D Hamburg, Germany — 3ELI Beamlines Project, Institute of Physics of the ASCR, Na Slovance 2, 18221 Prague, Czech Republic
Spectroscopic ellipsometry is a reliable and accurate tool to measure the optical properties of various types of samples. To get a better scientific knowledge of the spin structure and magnetic frustration in multiferroics, it is necessary to measure the optical parameters of the samples at different temperatures. In this work, we present the optical properties of HoMn2O5 as a function of temperature measured with spectroscopic ellipsometry. To understand the incommensurate antiferromagnetic ordering below 40K, we measured at various temperatures ranging between 45K and 14K and sweeping the energy from 0.5 eV to 5 eV. The different behavior of the dielectric function in the different magnetic phases will be discussed. Furthermore we analyzed the anisotropic behavior of HoMn2O5 at room temperature and identified a 2-fold symmetry behavior of the pseudodielectric function.