In the spring of 1986, K.A. Müller and J.G. Bednortz  revealed that at temperatures higher that 30 K the ceramic compounds of lanthanum, barrium and copper oxides go into a superconducting state. In February, 1987, C.W. Chu et al.  synthesized yttrium compounds which go over into a superconducting state at temperatures T c close to 90 K. Several months later new superconductors with T c > 30 K were synthesized almost simultaneously at different laboratories in the USA, Japan, the USSR and other countries. These superconductors were called as high-T c superconductors.
KeywordsIsotopic Effect Superconducting State Cooper Pair Magnetic Impurity Meissner Effect
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