Physics UD's Sci-Tech watch

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

Spread the love

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

4 Replies to “Room temperature superconductivity achieved (but at huge, crushing pressures)

  1. 1
    kairosfocus says:

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

  2. 2
    polistra says:

    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.

  3. 3
    polistra says:

    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.

  4. 4
    kairosfocus says:

    P, yes. There is no free lunch. KF

Leave a Reply