Relationship between Magnetic Structure and Ferroelectricity of LiVCuO4

Abstract

Neutron scattering studies and measurements of the dielectric susceptibility and ferroelectric polarization P have been carried out in various magnetic fields H for single-crystal samples of the multiferroic system LiVCuO4 with quasi one-dimensional spin 1/2 Cu2+ chains formed of edge-sharing CuO4 square planes, and the relationship between the magnetic structure and ferroelectricity has been studied. The ferroelectric polarization is significantly suppressed by the magnetic field H above 2 T applied along a and b axes. The helical magnetic structure with the helical axis parallel to c has been confirmed in H=0, and for H//a, the spin flop transition takes place at H=2 T with increasing H, where the helical axis changes to the direction parallel to H. The ferroelectric polarization along a at H=0 is found to be proportional to the neutron magnetic scattering intensity, indicating that the magnetic order is closely related to the appearance of the ferroelectricity. The relationship between the magnetic structure and ferroelectricity of LiVCuO4 is discussed by considering the existing theories.

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

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• Spin current and magneto-electric effect in non-collinear magnets
• Magnetically driven ferroelectric order in Ni${}_3$V${}_2$O${}_8$
• Spin-polarization coupling in multiferroic transition-metal oxides
• Ferroelectric Transition Induced by the Incommensurate Magnetic Ordering in LiCuVO4
• Density Functional Theory Characterization of the Multiferroicity in Spin Spiral Chain Cuprates
• Spin-modulated quasi-1D antiferromagnet LiCuVO_4
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