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

Figure 21

(a) Second derivative of 𝐼(𝑉) for a Bi2212 break junction in various magnetic fields (from 0-20𝑇). The structure of dips (minima) in 𝑑²𝐼/𝑑𝑉² can be compared with the phonon density of states 𝐹(𝜔); (b) the spectral functions 𝛼²𝐹(𝜔) in various magnetic fields. From [42–45].

(a)

(b)