Bosonic Spectral Function and the Electron-Phonon Interaction in HTSC Cuprates

Figure 19

Crystal structure of Ba₂Ca₃Cu₄O₈(O_𝛿F_1−𝛿)₂. There are four CuO₂ layers in a unit cell with the outer having apical F atoms. CRL—charge reservoir layer; SCL/OP—superconducting layer/outer plane; SCL/IP—superconducting layer/inner plane. From [152].