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

Figure 2

Magnetic spectral function Im𝜒⁽⁻⁾(𝐤,𝜔) in the normal state of YBa₂Cu₃O_6+𝑥 at 𝑇=100K and at 𝑄=(𝜋,𝜋). 100 counts in the vertical scale correspond to 𝜒^(−)max≈350𝜇^2𝐵/eV. The superconducting critical temperature 𝑇_𝑐(𝑥) by increasing doping (𝑥) from the underdoped system with 𝑥=0.5 (top) to the optimally doped one with 𝑥=0.97 (bottom): 𝑇_𝑐(𝑥)=45K (𝑥=0.5), 85K (𝑥=0.83), 91K (𝑥=0.92), and 92.5K (𝑥=0.97). From [30].