Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-07-15
Phys. Rev. Lett. 103, 156401 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.103.156401
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 presence of an electric field.
Giovannetti Gianluca
Khomskii Daniel
Kumar Sanjeev
Picozzi Silvia
van den Brink Jeroen
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