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APS » Phys. Rev. Lett. » Volume 98 » Issue 15

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Phys. Rev. Lett. 98, 157202 (2007) [4 pages]

Symmetry of Multiferroicity in a Frustrated Magnet TbMn₂O₅

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J. Okamoto,¹ D. J. Huang,^1,2,3 C.-Y. Mou,² K. S. Chao,³ H.-J. Lin,¹ S. Park,⁴ S-W. Cheong,⁴ and C. T. Chen¹
¹National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
²Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
³Department of Electrophysics, National Chiao-Tung University, Hsinchu 30010, Taiwan
⁴Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA

Received 21 April 2006; published 10 April 2007

Basedon measurements of soft-x-ray magnetic scattering and symmetry considerations, wedemonstrate that the magnetoelectric effect in TbMn₂O₅ arises from aninternal field determined by S-vector <sub>q-vector</sub> × <sub>-q-vector</sub> with being the magnetizationat modulation vector , whereas the magnetoelastic effect in theexchange energy governs the response to external electric fields. Ourresults set fundamental symmetry constraints on the microscopic mechanism ofmultiferroicity in frustrated magnets.

©2007 The American Physical Society

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.98.157202
DOI:	10.1103/PhysRevLett.98.157202
PACS:	75.25.+z; 77.80.-e; 78.70.Ck 75.25.+z Spin arrangements in magnetically ordered materials including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc 77.80.-e Ferroelectricity and antiferroelectricity 78.70.Ck X-ray scattering (condensed matter) YEAR: 2007

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