Berlin 2018 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 8: Multiferroics and magnetoelectrics I (joint session MA/KFM)
KFM 8.5: Vortrag
Dienstag, 13. März 2018, 10:30–10:45, EB 202
Local Magnetic and Electric Interactions in Multiferroic Ba2CoGe2O7 and Sr2CoSi2O7 — •Martina Schädler1, Titusz Fehér2, Norbert Büttgen1, Vilmos Kocsis3, Yoshinori Tokura3, Yasujiro Taguchi3, and István Kézsmárki1 — 1Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, Germany — 2Department of Physics, Budapest University of Technology and Economics, Hungary — 3RIKEN Center for Emergent Matter Science, Wako 351-0198, Japan
The multiferroic compound Ba2CoGe2O7 has drawn a lot of interest due to its non-centrosymmetric crystal structure, giving rise to peculiar magnetoelectric effects. The spin-dependent hybridization mechanism, that induces the electric polarization, results in a strong coupling of the magnetic moments and the local electric polarization, which allows control of the electric polarization via external magnetic fields. Due to its soft antiferromagnetic structure Ba2CoGe2O7 is a promising candidate for tuning the magnetic texture via the application of electric fields. Nuclear Magnetic Resonance (NMR) gives access to the local electric field gradient (EFG) via the nuclear quadrupole moment. We performed 59Co NMR measurements on Ba2CoGe2O7 and its sister compound Sr2CoSi2O7 in order to determine the local microscopic properties of magnetic spin order and electric polarization at the cobalt site. Through additional application of external electric fields we also investigated the possibility of influencing the local magnetic properties.