Ferroelectric displacements in multiferroic Y(Mn,Ga)O-3
- Adem, U.
- Nugroho, A. A.
- Meetsma, A.
- Palstra, T. T. M.
DOIAbstract
We have studied the effects of substitution of Mn3+ by Ga3+ on the crystal structure of YMnO3. Y(Mn,Ga)O-3 is a magnetoferroelectric in which the ferroelectric displacements from the YO7 polyhedra are associated with buckling and tilting of the MnO5 bipyramids. The differences in ionic radius and orbital occupation between Mn3+ and Ga3+ result in an increase of the c/a lattice parameter ratio. This dilation is not associated with the displacements of MnO5 bipyramids, but with the elongation of the YO6 antiprisms. The magnitude of the local YO6 dipoles decrease with Ga substitution.</p
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