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Room-temperature superconductors, those that do not offer any electrical resistance at ambient temperatures, are all the rage these days, given fast-paced developments on this front and the game-changer characteristics of any breakthrough that does materialize. Just recently, LK-99 has been touted as the most promising candidate to unlock the long-held utopian dream of a world dominated by room-temperature superconductors. Should this claim pass scientific rigor, veritable fortunes could be made within seconds.
Last week, we had examined the likelihood of a nitrogen-doped lutetium hydride compound as the first viable candidate for room-temperature superconductivity. On the 22nd of July 2023, a research team hailing from Korea University rocked the scientific world by claiming that LK-99, a gray-black compound of lead, copper, phosphorus, and oxygen, formally known as copper-substituted lead phosphate apatite, exhibited superconductivity characteristics at temperatures above 400 kelvins (126.85 degrees Celsius or 260 degrees Fahrenheit).
The South Korean team has submitted two preprint papers (here and here), claiming that the electrical resistivity of LK-99 dropped sharply at around 378 kelvin (220 degrees Fahrenheit), almost reaching the zero-bound at 333 Kelvin (140 degrees Fahrenheit).
The Meissner effect refers to the expulsion of magnetic fields as a superconductor transitions toward its superconducting state. The South Korean team has claimed that it observed this effect in LK-99, even going so far as to release a video of the copper-substituted lead phosphate apatite levitating
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