Yttrium Barium Copper Oxide
Yttrium barium copper oxide, or YBCO, chemical formula YBa2Cu3O7-δ, is a high-temperature superconductor with a superconducting temperature of 94K. Its discovery by C.W. Chu in 1987 launched the era of high-temperature superconductors. It was the first superconductor to break the liquid nitrogen barrier, i.e. the first to be superconducting at a temperature high enough to permit the use of liquid nitrogen as a coolant. Because liquid nitrogen, at 77K, is significantly less expensive than liquid helium, YBCO made a large number of commercial applications feasible for the first time.Yttrium barium copper oxide is used commercially in the fabrication of superconducting tapes and microwave filters.
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