Giant Electron-Phonon Anomaly in Doped and Other Cuprates
Figure 3
Phonon dispersions in Ru (from [8]). The data points correspond to experimental results. The solid lines represent results of the full DFT/LDA calculation. The Dotted lines were obtained by replacing q-dependent electron-phonon matrix element with the average value (which was q-independent). The dashed lines represent the DFT calculation without including the conduction electrons. Disappearance of the phonon softening near the M-point upon exclusion of conduction electrons demonstrates that the dip results from electron-phonon coupling.
