Date of this Version
Physical Review Letters
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.
Kenzelmann, M., Harris, A., Jonas, S. H., Broholm, C. L., Schefer, J., Kim, S., Zhang, C., Cheong, S., Vajk, O. P., & Lynn, J. W. (2005). Magnetic Inversion Symmetry Breaking and Ferroelectricity in TbMnO3. Physical Review Letters, 95 087206-1-087206-4. http://dx.doi.org/10.1103/PhysRevLett.95.087206
Date Posted: 20 August 2015
This document has been peer reviewed.