Regensburg 2010 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 8: [MA] Multiferroics II (Joint Session of MA/DF/KR/DS)

DS 8.2: Vortrag

Montag, 22. März 2010, 14:15–14:30, H3

Single Crystal X-ray diffraction studies on multiferroic YMn2−xFexO5 — •Sven Partzsch1, Jochen Geck1, Norman Leps1, Roberto Kraus1, Dmitr Souptel1, Bernd Büchner1, and Enrico Schierle21IFW Dresden — 2Helmholz-Zentrum Berlin

Temperature dependent single crystal X-ray diffraction studies of YMn2−xFexO5 are presented. Upon cooling, the undoped material (x=0) orders antiferromagnetically below TN ≈ 45   K and becomes multiferroic below TCE ≈ 39   K. This multiferroic phase is destabilized rapidly with increasing Fe-content and we address here the reasons for this dramatic effect. The crystallographic study implies that the doped Fe mainly occupies the square pyramidal coordinated Mn position instead the octahedral one, which shows that these lattice sites are crucial for the MF properties.

In order to further characterize the electronic ordering in the ferroelectric phase of the undoped samples, we also applied soft resonant X-ray diffraction, which clearly shows that the oxygen states play an important role as well.

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