Abstract
The incommensurate magnetic excitations of spin–charge ordered La 2 NiO 4.11 were studied by inelastic neutron scattering. With increasing energy up to ∼ 20 meV the maximum intensity of the spin excitations is observed to shift slightly towards the 2D antiferromagnetic wave vector ( 1 / 2 , 1 / 2 ) . This asymmetry in the magnon dispersion about the incommensurate wave vector is a similar effect, though less marked, to what has been observed in the layered cuprate superconductors.
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