Figure 3: Calculated phonon dispersion of Mn4Si7.
From: Twisting phonons in complex crystals with quasi-one-dimensional substructures
(a,b) Calculated harmonic dispersions of Mn4Si7 (solid black lines). The open symbols in (b) are the Gaussian fitting of the peak position of the INS line width measured with the triple-axis instrument at 300 K in the (200) zone (blue squares), 
zone (red circles) and 
zone (orange triangles) along [0K0]. (c,d) The calculated low-energy harmonic dispersions indexed by the polarization as LA, TA, twisting or other optical modes. The inset to (b) shows the modes close to the avoided crossing at ∼1 meV along the Γ−X direction, with the color coding of the modes the same as that in (c).
