Magnetically Induced Electronic Ferroelectricity in Half-Doped Manganites


Giovannetti, Gianluca and Kumar, Sanjeev and Brink, Jeroen van den and Picozzi, Silvia (2009) Magnetically Induced Electronic Ferroelectricity in Half-Doped Manganites. Physical Review Letters, 103 (3). 037601. ISSN 0031-9007

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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.
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Copyright:© 2009 The American Physical Society
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