Abstract
This review summarizes studies of the energy gap and selected electronic properties of CuO2 superconductors. The main focus is placed on results of inelastic light scattering experiments starting as early as 1987 just a year after the discovery of superconductivity in copper–oxygen compounds by Georg Bednorz and Alex Muller. I add a few historical and personal remarks on superconductivity in general and on the contribution of the eminent scientist Karl Alex Muller who passed away in January 2023.
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