Source: /cirosantilli/yttrium-barium-copper-oxide

= Yttrium barium copper oxide
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= YBCO
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Upside: superconducting above 92K, which is above the 77K of <liquid nitrogen>, and therefore much much cheaper to obtain and maintain than liquid helium.

Downside: it is brittle, so how do you make wires out of it? Still, can already be used in certain circuits, e.g. high temperature <SQUID devices>.