Chemical and adsorption action of foreign molecules on the properties of high-temperature superconductors

Data on the effect of adsorption and intercalation of foreign molecules on the properties of high-temperature superconducting materials, and on the co unter-effects of superconductivity on the electronic state of the adsorbed molecules and adsorption processes are considered. Particular attention is given to the critical analysis of experiment conditions and interpretation of the data obtained. An influence of adsorbed molecules on electrophysical state and critical parameters of superconductors is noted. Features of the interaction between materials in the superconducting state and molecules o f the external environment are discussed.