The incommensurate magnetic structure of YMn2O5: a stringent test of the multiferroic mechanism

C. Vecchini; L.C. Chapon; P.G. Radaelli; P.J. Brown; S. Park; S-W. Cheong

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The incommensurate magnetic structure of YMn2O5: a stringent test of the multiferroic mechanism

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arxiv 0808.2237 v1 pith:GYZYZHOJ submitted 2008-08-16 cond-mat.mtrl-sci cond-mat.str-el

P.G. Radaelli , C. Vecchini , L.C. Chapon , P.J. Brown , S. Park , S-W. Cheong This is my paper

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keywords incommensuratemagneticmechanismmultiferroicphasestructureymn2o5along

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We have determined the magnetic structure of the low-temperature incommensurate phase of multiferroic YMn2O5 using single-crystal neutron diffraction. By employing corepresentation analysis, we have ensured full compliance with both symmetry and physical constraints, so that the electrical polarization must lie along the b axis, as observed. The evolution of the spin components and propagation through the commensurate-incommensurate phase boundary points unambiguously at the exchange-striction mechanism as the primary driving force for ferroelectricity.

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