Dresden 2017 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 17: Ferroics - Domains, Domain Walls and Skyrmions IV
DF 17.7: Vortrag
Donnerstag, 23. März 2017, 11:30–11:45, WIL B321
Nuclear magnetic and electric interactions in multiferroic Ba2CoGe2O7 — •Martina Schädler1, Titusz Fehér2, Norbert Büttgen1, Vilmos Kocsis2, Yoshinori Tokura3, Yasujiro Taguchi3, Alois Loidl1, and István Kézsmárki2 — 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
In the multiferroic compound Ba2CoGe2O7 the electric polarization is induced magnetically by the spin-dependent hybridization mechanism. As a result the polarization arises locally inside the CoO4 tetrahedra and is dependent on the orientation of the external magnetic field H. Nuclear Magnetic Resonance (NMR) allows access to the local electric field gradient (EFG) via the nuclear quadrupole moment. We performed 59Co NMR measurements on Ba2CoGe2O7 for various orientations of the applied field in order to determine the local microscopic properties of magnetic spin order and electric polarization at the cobalt site: (1) we were able to model the local hyperfine field at the two magnetically inequivalent cobalt sites and (2) observed the displacement of the surrounding ions by the NMR quadrupolar effect.