Berlin 2012 – wissenschaftliches Programm
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KR: Fachgruppe Kristallographie
KR 5: Poster I – including Multiferroics (MA with DF, DS, KR, TT)
KR 5.35: Poster
Dienstag, 27. März 2012, 12:15–15:15, Poster A
Ferroelectricity and Magnetic Structure of Mn Moments in Multiferroic GdMnO3 — •Enrico Schierle1, Victor Soltwisch1, Christoph Trabant1,2, Alex Frano1,3, Detlef Schmitz1, Fabiano Yokaichiya1,6, Andrej Maljuk1,4, Dimitri Argyriou1,5, and Eugen Weschke1 — 1Helmholtz-Zentrum Berlin für Materialien und Energie, Germany — 2II. Physikalisches Institut, Universität zu Köln, Germany — 3MPI-FKF Stuttgart, Germany — 4IFW, Dresden, Germany — 5European Spallation Source, Lund, Sweden — 6Laboratrio Nacional de Luz Sincrotron, Campinas-SP, Brasil
Orthorhombic REMnO3 oxides can show strongly coupled ferroelectric (FE) and magnetic order, with FE polarization P induced by magnetic cycloids of the Mn spins[1,2]. However, from recent X-ray diffraction studies, there is growing evidence for a decisive role of ordering of the RE-4f moments as well and it seems that a large part of P can be explained by ionic displacements not necessarily connected with cycloidal magnetic order of Mn moments[3,4,5].
We employed Resonant Soft X-Ray Scattering at the Mn-L2,3 resonance to prove the existence of a ferroelectric phase at the surface of GdMnO3 even in zero external magnetic field and to examine its connection to the magnetic structure of the Mn moments in an element specific way.
Kimura et al., Nature 426, 55-58 (2003)
[2] Kenzelmann et al., PRL 95, 087206 (2005)
[3] Schierle et al., PRL 105, 167207 (2010)
[4] Feyerherm et al., Journal of Physics: Conference Series 200, 012032 (2010)
[5] Walker et al., Science 333, 1273 (2011)