The dispersion of the spin-waves in single crystals of Li 2 CuO 2 has been investigated by means of inelastic neutron scattering. The results yield a single spin-wave branch characterized by a large gap Δ = 1.4 meV at the zone centre due to easy-axis uniaxial anisotropy. Linear spin-wave theory is used to obtain the exchange integrals in this material. It turns out that the nearest-neighbor exchange interactions in the basal plane are antiferromagnetic leading to frustration between the magnetic moments. Our results show that Li 2 CuO 2 is an S = 1/2 antiferromagnetic insulator with competing interactions.
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Boehm et al. (1998) studied this question.
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