These new materials, such as the ceramic known as yttrium barium copper oxide, became a superconductor at 93 Kelvin—still cold, but not absolute-zero cold. But maybe even more importantly, these materials were the first superconductors above the boiling point of liquid nitrogen, which is cheaper and easier to handle than liquid helium. Today, the highest-temperature superconductor under ambient pressure is around 130 Kelvin, or -225 degrees Fahrenheit.
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