Ferroelectricity induced by acentric spin-density waves in YMn${}_2$O${}_5$

Abstract

The commensurate and incommensurate magnetic structures of the magnetoelectric system YMn${}_2$O${}_5$, as determined from neutron diffraction, were found to be spin-density waves lacking a global center of symmetry. We propose a model, based on a simple magneto-elastic coupling to the lattice, which enables us to predict the polarization based entirely on the observed magnetic structure. Our data accurately reproduce the temperature-dependence of the spontaneous polarization, in particular its sign reversal at the commensurate-incommensurate transition.

10 pages, 3 figures, 1 table

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