Phys Rev Lett. 2005 Aug 19;95(8):087206. Epub 2005 Aug 19.

Magnetic inversion symmetry breaking and ferroelectricity in TbMnO3.

Kenzelmann M, Harris AB, Jonas S, Broholm C, Schefer J, Kim SB, Zhang CL, Cheong SW, Vajk OP, Lynn JW.

Source

Laboratory for Solid State Physics, ETH Hönggerberg, CH-8093 Zürich, Switzerland.

Abstract

TbMnO3 is an orthorhombic insulator where incommensurate spin order for temperature T(N)<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.

PMID:: 16196899; [PubMed]

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