Magnetic inversion symmetry breaking and ferroelectricity in TbMnO3

Details Magnetic inversion symmetry breaking and ferroelectricity in TbMnO3 Magnetic inversion symmetry breaking and ferroelectricity in TbMnO3

2005-06-08

arxiv.org/abs/cond-mat/0506201v2

Phys. Rev. Lett. 95, 087206 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages revtex, accepted by Phys. Rev. Lett. on June 21, 2005

Scientific paper

10.1103/PhysRevLett.95.087206

TbMnO3 is an orthorhombic insulator where incommensurate spin order for temperature T_N < 41K is accompanied by ferroelectric order for T < 28K. 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.

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