Neutron Scattering Study on the Quasi-One-Dimensional Spin-Gap System CuNb₂O₆

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Inelastic neutron measurements have been performed on a quasi-one-dimensional spin-gap system CuNb₂O₆. From the dispersion curve of the triplet excitation, the compound has been found to have a ferromagnetic-antiferromagnetic alternating bond chain. The temperature (T) dependence of the magnetic excitation spectra indicates that both the singlet correlation and the antiferromagnetic correlation begin to grow with decreasing T at around T₀, where the spin susceptibility becomes maximum.