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The coupling of phonons with collective modes and single-particle gapexcitations associated with one (1d) and two-directional (2d)electronically-driven charge-density wave (CDW) ordering in metallic RTe_3 isinvestigated as a function of rare-earth ion chemical pressure (R=Tb, Dy, Ho)using femtosecond pump-probe spectroscopy. From the T-dependence of the CDW gap\Delta_{CDW} and the amplitude mode (AM) we find that while the transition to a1d-CDW ordered state at T_{c1} initially proceeds in an exemplary mean-field(MF) -like fashion, below T_{c1}, \Delta_{CDW} is depressed and departs fromthe MF behavior. The effect is apparently triggered by resonant mode-mixing ofthe amplitude mode (AM) with a totally symmetric phonon at 1.75 THz. At lowtemperatures, when the state evolves into a 2d-CDW ordered state at T_{c2} inthe DyTe_3 and HoTe_3, additional much weaker mode mixing is evident but nosoft mode is observed.

Single-particle and collective mode couplings associated with 1- and 2-directional electronic ordering in metallic RTe$_3$ (R = Ho, Dy, Tb)