Rare-earth tritellurides represent quasi-two-dimensional systems that exhibit multiple charge density wave (CDW) transitions alongside magnetic ordering. However, the interplay between the phonon dynamics of collective excitations and local magnetism remains unclear. ${\mathrm{GdTe}}_3$ is an interesting material having an incommensurate CDW (ICDW), at $T_{\mathrm{ICDW}}\sim 380$ K, an antiferromagnetic transition at $T_N\sim 13$ K, and with an expectation of another CDW ordering. We emphasize electron-spin-phonon and mode coupling in ${\mathrm{GdTe}}_3$ through temperature dependent Raman spectroscopy complemented by heat capacity and magnetization measurements. Disappearance of zone-folded mode (Z*) and observed coupling behavior of amplitude mode suggest the existence of another ordering at $\sim 240$ K, in addition to known ICDW. By employing phonon renormalization, we estimated significant strength of spin-phonon coupling, $({\lambda }_{\mathrm{s}-\mathrm{ph}}\sim 0.234)$ and accentuated on the phonon dynamics associated with CDW instabilities in ${\mathrm{GdTe}}_3$.

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• Charge density waves
• Electronic phase separation
• Magnetic interactions
• Layered semiconductors
• Strongly correlated systems
• Inelastic light scattering
• Raman spectroscopy