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We present a detailed study of complex dielectric constant and ferroelectricpolarization in multiferroic LiCuVO4 as function of temperature and externalmagnetic field. In zero external magnetic field, spiral spin order with an abhelix and a propagation vector along the crystallographic b direction isestablished, which induces ferroelectric order with spontaneous polarizationparallel to a. The direction of the helix can be reoriented by an externalmagnetic field and allows switching of the spontaneous polarization. We find astrong dependence of the absolute value of the polarization for differentorientations of the spiral plane. Above 7.5 T, LiCuVO4 reveals collinear spinorder and remains paraelectric for all field directions. Thus this system isideally suited to check the symmetry relations for spiral magnets as predictedtheoretically. The strong coupling of ferroelectric and magnetic order isdocumented and the complex (B,T) phase diagram is fully explored.

Switching the Ferroelectric Polarization by External Magnetic Fields in the Spin = 1/2 Chain Cuprate LiCuVO4