Ciro Santilli
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Yttrium barium copper oxide (YBCO) | 🗖 nosplit | ↑ parent "Superconducting materials" | 59

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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.
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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.
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