Effect of Chemical Pressure on the Charge Density Wave Transition in   Rare-earth Tritellurides RTe_3
  The charge density wave transition is investigated in the bi-layer family of rare earth tritelluride RTe_3 compounds (R = Sm, Gd, Tb, Dy, Ho, Er, Tm) via high resolution x-ray diffraction and electrical resistivity. The transition temperature increases monotonically with increasing lattice parameter from 244(3) K for TmTe_3 to 416(3) K for SmTe_3. The heaviest members of the series, R = Dy, Ho, Er, Tm, are observed to have a second transition at a lower temperature, which marks the onset of an additional CDW with wavevector almost equal in magnitude to the first, but oriented in the perpendicular direction. 
N. Ru, C. L. Condron, G. Y. Margulis, K. Y. Shin, J. Laverock, S. B.   Dugdale, M. F. Toney, I. R. Fisher