Ferroelectricity Induced by Acentric Spin-Density Waves in YMn₂O₅

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L. C. Chapon,¹ P. G. Radaelli,^1,2 G. R. Blake,^1,3 S. Park,⁴ and S.-W. Cheong⁴
¹ISIS Facility, Rutherford Appleton Laboratory-CCLRC, Chilton, Didcot, Oxfordshire, OX11 0QX, United Kingdom
²Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom
³Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
⁴Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA

Received 7 November 2005; published 7 March 2006

Thecommensurate and incommensurate magnetic structures of the magnetoelectric system YMn₂O₅,as determined from neutron diffraction, were found to be spin-densitywaves lacking a global center of symmetry. We propose amodel, based on a simple magnetoelastic coupling to the lattice,which enables us to predict the polarization based entirely onthe observed magnetic structure. Our data accurately reproduce the temperaturedependence of the spontaneous polarization, particularly its sign reversal atthe commensurate-incommensurate transition.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.96.097601
DOI:	10.1103/PhysRevLett.96.097601
PACS:	77.80.-e; 61.12.-q; 75.25.+z; 75.30.Fv 77.80.-e Ferroelectricity and antiferroelectricity 61.12.-q Neutron diffraction and scattering 75.25.+z Spin arrangements in magnetically ordered materials including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc 75.30.Fv Spin-density waves in magnetically ordered materials YEAR: 2006
KEYWORDS:	commensurate-incommensurate transformations, spin density waves, ferroelectricity, magnetoelectric effects, yttrium compounds, neutron diffraction, magnetic structure

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