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Room temperature superconductivity achieved (but at huge, crushing pressures)

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From Nature:

Published: 14 October 2020
Room-temperature superconductivity in a carbonaceous sulfur
hydride
Elliot Snider, Nathan Dasenbrock-Gammon, Raymond McBride, Mathew Debessai, Hiranya
Vindana, Kevin Vencatasamy, Keith V. Lawler, Ashkan Salamat & Ranga P. Dias  
Nature  586, 373–377(2020)

One of the long-standing challenges in experimental physics is the observation of room-temperature superconductivity1’2. Recently, high-temperature conventional superconductivity in hydrogen-rich materials has been reported in several systems under high pressure . . . Here we report superconductivity in a photochemically transformed carbonaceous sulfur hydride system, starting from elemental precursors, with a maximum superconducting transition temperature of 287.7 +/- 1.2 kelvin (about 15 degrees Celsius) achieved at 267 +/- 10 gigapascals. The superconducting state is observed over a broad pressure range in the diamond anvil cell, from 140 to 275 gigapascals, with a sharp upturn in transition temperature above 220 gigapascals . . .

Quite an achievement, but of course not anywhere near room temp superconducting generators or transmission lines or magnets. END

Comments
P, yes. There is no free lunch. KFkairosfocus
October 27, 2020
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A nice down-home illustration of the amount of heat they're trying to avoid with these extreme tricks. We had a snowstorm Friday that coated all the wires with a half-inch of sticky snow. The powerline above my house carries thousands of amps through copper with a resistance of about 30 ohms per mile. It took a full day for the snow 'insulation' to melt, and the wire didn't melt any faster than the tree branches. The sun was doing all the melting in both cases. Not a whole lot of heat coming from that wire.polistra
October 25, 2020
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Ain't no free lunch. In order to get the resistance of a wire down from about 30 ohms per mile to 0 ohms per mile, the wire has to be kept at 6 million atmospheres, or at -450 degrees F. The cost of maintaining those super-extreme conditions on a long wire is perfectly prohibitive, and would consume VASTLY more electricity and produce VASTLY more heat than the heat loss from 30 ohms.polistra
October 25, 2020
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Room temperature superconductivity achieved (but at huge, crushing pressures)kairosfocus
October 25, 2020
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