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 YMn_2−xFe_xO₅ — •Sven Partzsch¹, Jochen Geck¹, Norman Leps¹, Roberto Kraus¹, Dmitr Souptel¹, Bernd Büchner¹, and Enrico Schierle² — ¹IFW Dresden — ²Helmholz-Zentrum Berlin

Temperature dependent single crystal X-ray diffraction studies of YMn_2−xFe_xO₅ are presented. Upon cooling, the undoped material (x=0) orders antiferromagnetically below T_N ≈ 45   K and becomes multiferroic below T_CE ≈ 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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