Magnetically-driven ferroelectric atomic displacements of the order of 10−3Angstromhavebeenobservedinorthorhombic(perovskitelike)YMnO_3byasingle−crystalsynchrotronx−raydiffraction.TherefinedpolarstructureshowsthecharacteristicbondalternationdrivenbytheexchangestrictioninstaggeredMn−O−Mnarrayswith\uparrow\uparrow\downarrow\downarrow$ type ordering, giving rise to a spontaneous polarization along a-axis. First-principles calculations based on the Berry phase method as well as on the experimentally refined crystal structure can reproduce the observed polarization value.
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