fig3
From: Pressure-induced superconductivity in hypercoordinated 5p-block element nitrides MN6 (M = Sb, Te, I)

Figure 3. EPC in TeN6. (A) Phonon dispersion curve. Blue circles represent the q-resolved EPC parameter λq; the radii of circles are proportional to the strength; (B) PHDOS. The illustrations and percentages are the contribution of the vibration modes to the EPC parameter λ; (C) Eliashberg spectral function α2F(ω) and integral EPC parameter λ(ω) as a function of frequency. EPC: electron-phonon coupling; PHDOS: phonon density of states.