Multiferroicity in Rare-Earth Nickelates RNiO3


Giovannetti, Gianluca and Kumar, Sanjeev and Khomskii, Daniel and Picozzi, Silvia and Brink, Jeroen van den (2009) Multiferroicity in Rare-Earth Nickelates RNiO3. Physical Review Letters, 103 (15). p. 156401. ISSN 0031-9007

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Abstract:We show that charge ordered rare-earth nickelates of the type RNiO3 (R=Ho, Lu, Pr and Nd) are multiferroic with very large magnetically-induced ferroelectric (FE) polarizations. This we determine from first principles electronic structure calculations. The emerging FE polarization is directly tied to the long-standing puzzle of which kind of magnetic ordering is present in this class of materials: its direction and size indicate the type of ground-state spin configuration that is realized. Vice versa, the small energy differences between the different magnetic orderings suggest that a chosen magnetic ordering can be stabilized by cooling the system in the presence of an electric field.
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Copyright:© 2009 The American Physical Society
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Metis ID: 259549