期刊
PHYSICAL REVIEW B
卷 79, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.020404
关键词
dielectric polarisation; magnetic structure; multiferroics; neutron diffraction; yttrium compounds
We have determined the magnetic structure of the low-temperature incommensurate phase of multiferroic YMn2O5 using single-crystal neutron diffraction. By employing corepresentation analysis, we have ensured full compliance with both symmetry and physical constraints, so that the electrical polarization must lie along the b axis, as observed. The evolution of the spin components and propagation through the commensurate-incommensurate phase boundary identifies the exchange-striction mechanism as the primary driving force for ferroelectricity.
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