Figure 4

(a) The measured inelastic spectra at the 0 1 8 Brillouin zone (\(\mathbf{q}=(0.00, -0.05, 0.00)\)) temperatures 1.5 and 300 K. The results are shown for CePd2Al2 and LaPd2Al2 compounds. (b) The calculated intensity (full black line) is the sum of all 30 modes at the 0 1 8 Brillouin zone for CePd2Al2, the most intense modes are labelled.