Origin of ferroelectricity in the multiferroic barium fluorides BaMF4

Details Origin of ferroelectricity in the multiferroic barium fluorides BaMF4 Origin of ferroelectricity in the multiferroic barium fluorides BaMF4

2006-05-01

arxiv.org/abs/cond-mat/0605042v1

Physics

Condensed Matter

Materials Science

8 pages, 6 figures, 3 tables

Scientific paper

10.1103/PhysRevB.74.024102

We present a first principles study of the series of multiferroic barium fluorides with the composition BaMF4, where M is Mn, Fe, Co, or Ni. We discuss trends in the structural, electronic, and magnetic properties, and we show that the ferroelectricity in these systems results from the "freezing in" of a single unstable polar phonon mode. In contrast to the case of the standard perovskite ferroelectrics, this structural distortion is not accompanied by charge transfer between cations and anions. Thus, the ferroelectric instability in the multiferroic barium fluorides arises solely due to size effects and the special geometrical constraints of the underlying crystal structure.

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