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Neutron diffraction and 7Li-NMR have been applied to determine themultiferroic system LiCu2O2, which has four chains (ribbon chains) ofedge-sharing CuO4 square planes in a unit cell. We have confirmed that thereare successive magnetic transitions at TN1=24.5 K and TN2=22.8 K. In the Tregion between TN1 and TN2, the quasi one-dimensional spins (S=1/2) of Cu2+ions within a chain have a collinear and sinusoidally modulated structure withCu-moments parallel to the c-axis and with the modulation vector along theb-axis. At T < TN2, an ellipsoidal helical spin structure with theincommensurate modulation has been found. Here, we present detailed parameters,describing the modulation amplitudes, helical axis vectors as well as therelative phases of the modulations of four ribbon chains, which can wellreproduce both the NMR and neutron results in the two magnetically orderedphases. This finding of the rather precise magnetic structures enables us todiscuss the relationship between the magnetic structure and the multiferroicnature of the present system in zero magnetic field, as presented in ourcompanion paper (paper I), and open a way how to understand the reportedelectric polarization under the finite magnetic field.

Studies of Multiferroic System of LiCu2O2 II Magnetic Structures of Two Ordered Phases with Incommensurate Modulations