Magnetically induced electronic ferroelectricity in half-doped manganites

G. Giovannetti, S. Kumar, J. van den Brink, Silvia Picozzi

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Abstract

Using a joint approach of density functional theory and model calculations, we demonstrate that a prototypical charge ordered half-doped manganite La1/2Ca1/2MnO3 is multiferroic. The combination of a peculiar charge-orbital ordering and a tendency to form spin dimers breaks the inversion symmetry and leads to a ferroelectric ground state with a polarization up to several μC/cm2. The presence of improper ferroelectricity does not depend on the hotly debated structural details of this material: in the Zener-polaron structure we find a similar ferroelectric response with a large polarization of purely magnetic origin.
Original languageUndefined
Pages (from-to)037601/1-037601/4
Number of pages4
JournalPhysical review letters
Volume103
Issue number3
DOIs
Publication statusPublished - 2009

Keywords

  • METIS-259489
  • IR-73645

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