SUPERconductors

Yttrium barium copper oxide, or YBCO, chemical formula YBa₂Cu₃O₇-d is a high -T (94 K) superconductor. Discovered by C.W. Chu in 1987 launched the era of high- temperature superconductors - it was the first material to break the liquid nitrogen (77 K) barrier.

A surprising discovery came in 2001: crystallographically simple MgB₂ becomes superconductive at 39 K. Also lithium becomes superconducting, at high (48 GPa) pressure. Scientists do not exclude that even hydrogen, at high pressures, in metallic phase can be superconducting.

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Table B