“…All the inelastic neutron scattering experiments were performed by using a range of thermal and cold neutron triple-axis spectrometers, including PUMA at MLZ, FLEXX [51] References [17, 18, 23-27, 32, 34, 35, 40, 43, 47, 48, 52-60] V. ACKNOWLEDGMENTS The lattice parameter c = 20.681(75) Å for CrSiTe 3 and c = 20.603(99) Å for CrGeTe 3 at room temperature extracted from XRD (in Fig. S1[(a),(b)]) is quite consistent with the previous results [52][53][54]. From the temperature dependence of the magnetic susceptibility (shown in Fig.…”