2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/102345Nearly steady-state locked intrinsic localized modes (ILMs) in the quasi-1d antiferromagnet (C2H5NH3)2CuCl4 are detected via four-wave mixing emission or the uniform mode absorption. Exploiting the long-time stability of these locked ILMs, repeatable nonlinear switching is observed by varying the sample temperature, and localized modes with various amplitudes are created by modulation of the microwave driver power. This steady-state ILM locking technique could be used to produce energy localization in other atomic lattices.4 pages, 4 figures, submitted to Phys. Rev. Lett. v.2 : clarifications of text and figures in response to commentsPattern Formation and SolitonsOther Condensed Mattertext