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We report an observation of spatial solitons in a medium managed to present fifth-seventh (focusing-defocusing) refractive nonlinearities with suppressed third-order nonlinearity. Propagation of two-dimensional bright spatial solitons for {~}10 Rayleigh lengths was observed and characterized in a suspension of silver nanoparticles in acetone using the scattered light imaging method. Numerical calculations based on a nonlinear Schr\"odinger-type equation, including contributions up to the seventh-order susceptibility, were performed showing good agreement with the experimental results.
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Reyna et al. (2014) studied this question.
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