Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: Poster I
MA 19.13: Poster
Dienstag, 1. April 2014, 13:00–15:30, P1
Neutron diffraction and XMCD on YFe2O4−δ single crystals. — •Thomas Mueller1, Yixi Su2, Kirill Nemkovskiy2, John Freeland3, David Keavney3, Richard A. Rosenberg3, and Manuel Angst1 — 1Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, 52425 Jülich, GERMANY — 2Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at MLZ Lichtenbergstraße 1, 85747 Garching, GERMANY — 3Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439, USA
YFe2O4−δ is isostructural to LuFe2O4 the former primary example for a charge order multiferroic, but the ionic radius of Y is much larger compared to Lu, leading to completely different ordering phenomena. We have grown highly stoichiometric single crystals of YFe2O4−δ by the optical floating zone method, showing for the first time 3D charge and magnetic ordering. Here we present single crystal neutron diffraction performed at the DNS instrument at the MLZ, with full polarization analysis to distinguish magnetic from charge-order scattering and to determine the magnetic moment directions. We were able to identify contributions from three magnetic domains arranged in a 120∘ pattern. XMCD measurements at 4-ID-C at the APS were performed to probe for orbital contributions and to get valance specific information about the magnetic moments.