Magnetic structure of the edge-sharing copper oxide chain compound NaCu2O2

Abstract

Single-crystal neutron diffraction has been used to determine the incommensurate magnetic structure of NaCu2O2, a compound built up of chains of edge-sharing CuO4 plaquettes. Magnetic structures compatible with the lattice symmetry were identified by a group-theoretical analysis, and their magnetic structure factors were compared to the experimentally observed Bragg intensities. In conjunction with other experimental data, this analysis yields an elliptical helix structure in which both the helicity and the polarization plane alternate among copper-oxide chains. This magnetic ground state is discussed in the context of the recently reported multiferroic properties of other copper-oxide chain compounds.

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• Spin exchange dominated by charge fluctuations of the Wigner lattice in the newly synthesized chain cuprate Na5Cu3O6
• Highly dispersive magnons with spin-gap like features in the frustrated ferromagnetic S=1/2 chain compound Ca2Y2Cu5O10 detected by inelastic neutron scattering
• Spiral ground state against ferroelectricity in the frustrated magnet BiMnFe2O6
• The origin of up-up-down-down magnetic order in Cu${}_2$GeO${}_4$
• Frustrated magnetic planes with intricate interaction pathways in the mineral langite Cu${}_4$(OH)${}_6$SO${}_4\cdot 2$H${}_2$O
• Emergent phases in a compass chain with multisite interactions
• Incommensurate and multiple-$\mathbf{q}$ magnetic misfit order in the frustrated quantum-spin-ladder material antlerite, Cu${}_3$SO${}_4$(OH)${}_4$
• The spiral spin state in a zigzag spin chain system
• Incommensurate magnetism in K${}_2$MnS${}_{2-x}$Se${}_x$ and prospects for tunable frustration in a triangular lattice of pseudo-1D spin chains
• Bond distortion effects and electric orders in spiral multiferroic magnets
• Anisotropic optical response of the mixed-valent Mott-Hubbard insulator NaCu2O2