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South Korean Scientists Claim Ambient Temp. Superconductivity
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TimFox:
MRI superconductors need to work at high current and high magnetic field, not just superconduct at a useful temperature.
gnuarm:

--- Quote from: HuronKing on July 27, 2023, 09:02:22 pm ---
--- Quote from: gnuarm on July 27, 2023, 08:35:36 pm ---
--- Quote from: HuronKing on July 27, 2023, 08:18:25 pm ---
--- Quote from: gnuarm on July 27, 2023, 05:35:59 pm ---I thought we already had superconductors at liquid nitrogen temperatures?  That's much easier to come by than liquid helium.  You can easily make liquid nitrogen in any facility.

--- End quote ---

Liquid nitrogen can only get down to 60K. That's used for external cooling. The internal MRI magnet materials need to get down to 4K for superconductivity:
https://mriquestions.com/superconductive-design.html

The cooling apparatus are the most expensive and difficult part of MRI machines. Eliminating the need for complex liquid helium containment would make MRI machines far cheaper and mobile.

--- End quote ---

I'm sure that's true for various MRI machines.  But superconductors exist at temperatures well above 60 °K.

--- End quote ---

Yes but none of those are suitable for applications where we need to use liquid helium (MRIs being the most common case) which is what I thought you were referring to (since that's the example I was pointing at). :)

Some stuff can superconduct with liquid nitrogen but its still hardly ambient temp!  ;D

--- End quote ---

Which is what I said, no? 



--- Quote ---I thought we already had superconductors at liquid nitrogen temperatures?
--- End quote ---
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