Giant Electron-Phonon Anomaly in Doped La₂CuO₄and Other Cuprates

Figure 6

A comparison between measured (red) and calculated (blue, black) phonon dispersions and the LDA calculation in Cr. Only the data for the lowest energy transverse phonons near the zone boundary line connecting 𝐪=(1,0,0) and 𝐪=(0.5,0.5,0) are shown. The smearing has a strong effect in (a) but not in (b) (from [25]).

(a)

(b)

(c)

(d)