Constitution and synthesis of high-Tc superconductors

Local transformation of the electronic structure and generation of free carriers in cuprates and ferropnictides under heterovalent and isovalent doping

“…However, due to the large difference between the radii of Cu and Ag, it is impossible to carry out substitution in the required proportion (~50%). At the same time, it is known that the substitution of 5% Cu for Ag in nonsuperconducting La2CuO4 actually results in the formation of a superconducting phase with Tc = 28 K [22].…”