Ferroelectricity from spin supercurrents in LiCuVO4

Details Ferroelectricity from spin supercurrents in LiCuVO4 Ferroelectricity from spin supercurrents in LiCuVO4

2011-03-22

arxiv.org/abs/1103.4319v1

Phys. Rev. B 83, 100409(R) (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, final version

Scientific paper

10.1103/PhysRevB.83.100409

We have studied the magnetic structure of the ferroelectric frustrated spin-1/2 chain material LiCuVO4 in applied electric and magnetic fields using polarized neutrons. A symmetry and mean-field analysis of the data rules out the presence of static Dzyaloshinskii-Moriya interaction, while exchange striction is shown to be negligible by our specific-heat measurements. The experimentally observed magnetoelectric coupling is in excellent agreement with the predictions of a purely electronic mechanism based on spin supercurrents.

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