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The magnetic excitation spectrums of charge stripe ordered La(2-x)Sr(x)NiO(4)x = 0.45 and x = 0.4 were studied by inelastic neutron scattering. We found themagnetic excitation spectrum of x = 0.45 from the ordered Ni^2+ S = 1 spins tomatch that of checkerboard charge ordered La(1.5)Sr(0.5)NiO(4). The distinctiveasymmetry in the magnetic excitations above 40 meV was observed for both dopinglevels, but an additional ferromagnetic mode was observed in x = 0.45 and notin the x = 0.4. We discuss the origin of crossover in the excitation spectrumbetween x = 0.45 and x = 0.4 with respect to discommensurations in the chargestripe structure.

Development of the Magnetic Excitations of Charge-Stripe Ordered La(2-x)Sr(x)NiO(4) on Doping Towards Checkerboard Charge Order