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

Abstract

Neutron diffraction and 7Li-NMR have been applied to determine the multiferroic system LiCu2O2, which has four chains (ribbon chains) of edge-sharing CuO4 square planes in a unit cell. We have confirmed that there are successive magnetic transitions at TN1=24.5 K and TN2=22.8 K. In the T region 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 with Cu-moments parallel to the c-axis and with the modulation vector along the b-axis. At T < TN2, an ellipsoidal helical spin structure with the incommensurate modulation has been found. Here, we present detailed parameters, describing the modulation amplitudes, helical axis vectors as well as the relative phases of the modulations of four ribbon chains, which can well reproduce both the NMR and neutron results in the two magnetically ordered phases. This finding of the rather precise magnetic structures enables us to discuss the relationship between the magnetic structure and the multiferroic nature of the present system in zero magnetic field, as presented in our companion paper (paper I), and open a way how to understand the reported electric polarization under the finite magnetic field.

4 pages, 5 figures, submitted to J. Phys. Soc. Jpn

References in corpus (6)

• Spin current and magneto-electric effect in non-collinear magnets
• Correlation between spin helicity and electric polarization vector in quantum-spin chain magnet LiCu${}_2$O${}_2$
• Ferroelectric Transition Induced by the Incommensurate Magnetic Ordering in LiCuVO4
• Relationship between Magnetic Structure and Ferroelectricity of LiVCuO4
• Multiferroicity in the spin-1/2 quantum matter of LiCu2O2
• Studies of Multiferroic System LiCu2O2 I Sample Characterization and Relationship between Magnetic Properties and Multiferroic Nature

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