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Ferroelectricity from spin supercurrents in LiCuVO4

By M. Mourigal, M. Enderle, R. K. Kremer, J. M. Law and B. Fåk

Abstract

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.Comment: 4 pages, 3 figures, final versio

Topics: Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science
Year: 2011
DOI identifier: 10.1103/PhysRevB.83.100409
OAI identifier: oai:arXiv.org:1103.4319
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