title: Electronic correlations decimate the ferroelectric polarization of multiferroic homn2o5.
abstract: We show that electronic correlations decimate the intrinsic ferroelectric polarization of multiferroic manganites RMn2O5, where R is a rare earth element. Such is manifest from ab initio band structure computations that account for the Coulomb interactions between the manganese 3d electrons--the root of magnetism in RMn2O5. Including these leads to an amplitude and direction of polarization of HoMn2O5 that agree with experiment. The decimation is caused by a near cancellation of the ionic polarization induced by the lattice and the electronic one due to valence charge redistributions.
authors.affiliation: Institute Lorentz for Theoretical Physics, Leiden University, P.O. Box 9506, 2300 RA Leiden, The Netherlands.
authors.forename: Gianluca
authors.initials: G
authors.lastname: Giovannetti
authors.forename: Jeroen
authors.initials: J
authors.lastname: van den Brink