Dresden 2011 – wissenschaftliches Programm

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KR: Fachgruppe Kristallographie

KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)

KR 5.54: Poster

Dienstag, 15. März 2011, 10:45–13:00, P2

Magnetic structure of multiferroic GdMnO₃ explored by Resonant Soft X-ray Scattering — •Enrico Schierle¹, Victor Soltwisch¹, Detlef Schmitz¹, Andrey Malyuk², Fabiano Yokaichiya², Dimitri N. Argyriou², and Eugen Weschke¹ — ¹Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489 Berlin, Germany — ²Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany

In the orthorombic ReMnO₃s (Re=Gd, Dy, Tb), ferroelectric polarization is induced by complex magnetic structures resulting in a strong coupling of the two ordering phenomena [1]. While the multiferroic properties are dominated by the cycloidal structure of Mn moments as established by neutron diffraction [2], there is growing evidence for a decisive role of ordering of the Re-4f moments as well. This has been highlighted by x-ray diffraction studies as a complementary tool [3,4]. Particularly, resonant soft x-ray scattering (RSXS) is well suited to study details on the magnetic structure in an element-specific way [4]. We studied the magnetic ordering of the Gd-4f spins of GdMnO₃ in detail by RSXS, sheding new light on the possible mechanisms of multiferroicity. The experiment was performed using a very recently commissioned diffractometer for RSXS built at HZB.

[1] Kimura et al., Nature 426, 55-58 (2003)

[2] Kenzelmann et al., PRL 95, 087206 (2005)

[3] Prokhnenko et al., PRL 98, 057206 (2007)

[4] Schierle et al., PRL 105, 167207 (2010)