Giant Electron-Phonon Anomaly in Doped and Other Cuprates
Figure 26
Bond stretching phonons in HgBa2CuO4+x (from [77]). (a) Enlarged spectra taken close to the bond stretching mode plotted on a linear scale. (b) Data points represent frequencies of the bond-stretching phonons. The lines show the shell model calculation in which the interaction between the next-nearest neighbor oxygens in the CuO2 plane is added. The lines indicate (top to bottom) the c-polarized apical oxygen mode, the a-polarized Cu–O bond stretching mode, and the a-polarized in-plane Cu–O bending mode, respectively. The vertical bars indicate the FWHM of the peaks determined in fitting data shown in (a).
