Europhysics Letters (EPL) · 1998 · 60 citations · 6 references
The dispersion of the spin-waves in single crystals of Li<sub>2</sub>CuO<sub>2</sub> 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<sub>2</sub>CuO<sub>2</sub> is an <em>S</em> = 1/2 antiferromagnetic insulator with competing interactions.
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Dynamics of Coupled Quantum Spin Chains
H. J. Schulz · Physical Review Letters · 1996 · 338 citations · Full text
Crystal and magnetic structure of Li2CuO2
Fernando Sapiña, J. Rodrı́guez-Carvajal, M. J. Sanchı́s et al. · Solid State Communications · 1990 · 137 citations