Misfit Strain in Superlattices Controlling the Electron-Lattice Interaction via Microstrain in Active Layers

Figure 4

3D universal phase diagram of the superconducting critical temperature of cuprates. The values of color plot of the superconducting transition temperature 𝑇_𝑐 go from 0 (black) to 135 K (white). The misfit strain 𝜂 (i.e., microstrain or internal chemical pressure) and the doping 𝛿 are normalized to the critical values of the 1/8 phase (𝛿_𝑐,𝜂_𝑐); therefore the critical point is at (1, 1) where the superconducting critical temperature goes to zero (black). The maximum of the critical temperature occurs at (1.4, 0.5), that is, at doping 0.16 and misfit strain 0.35.