Superdiamagnetics and the high-temperature superconductivity problem

The superdiamagnetism observed in CuCl and CdS, with its special features, can be explained by the electron localization in grains of polycrystalline specimens. The similarity in behavior between superdiamagnetics and high-temperature superconductors with transition temperatures near room temperature prompts one to assume that the superconductivity in the latter is connected with electron localization in grains of ceramics.