Magnetic inversion symmetry breaking and ferroelectricity in TbMnO3

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Title: Magnetic inversion symmetry breaking and ferroelectricity in TbMnO3
Author: Kenzelmann, M.; Harris, A.B.; Jonas, S.; Broholm, C.; Schefer, J.; Kim, S.B.; Zhang, C.L.; Cheong, S.-W.; Vajk, O.P.; Lynn, J.W.
Abstract: TbMnO3 is an orthorhombic insulator where incommensurate spin order for temperature TN<41 K is accompanied by ferroelectric order for T<28 K. To understand this, we establish the magnetic structure above and below the ferroelectric transition using neutron diffraction. In the paraelectric phase, the spin structure is incommensurate and longitudinally modulated. In the ferroelectric phase, however, there is a transverse incommensurate spiral. We show that the spiral breaks spatial inversion symmetry and can account for magnetoelectricity in TbMnO3.
URI: http://jhir.library.jhu.edu/handle/1774.2/33757
Date: 2005-08-19
Citation: Physical Review Letters 19 Aug. 2005, vol.95, no.8, pp. 087206/1-4
Subject: ferroelectric order
incommensurate spin order
orthorhombic insulator
spin structure
transverse incommensurate spiral
terbium compounds
neutron diffraction
ferroelectric transitions
antiferromagnetic materials
spatial inversion symmetry breaking
magnetoelectricity
TbMnO3

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