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Rare earth tritelluride TbTe, ErTeand HoTeexhibit two successive charge density wave phase transitionsand. The transition to the incommensurate phase atis reflected in the longitudinal elastic stiffness componentsand. In the incommensurate phase belowthe longitudinal stiffness components,are augmented by a contribution from quartic anharmonic interaction with the onset of the incommensurate ordering. The temperature dependences of the elastic constants,are shown to follow alaw. The mechanism for the lower CDW phase transition is significantly different from that at the upper CDW phase transition.

Elastic properties at the charge density wave phase transitions in TbTe 3 , ErTe 3 and HoTe 3