Ferromagnetic half levitation of LK-99-like synthetic samples

Re:Ferromagnetic half levitation of LK-99-like synthetic sam... by chmod600 on Tuesday August 08, 2023 @02:43AM (#37045342)

I think you are missing the point: a typical ohmmeter would have metal probes, so with a superconductor you would just be measuring the resistance of those probes. Any attempt to overcome that problem probably introduces a lot of chances for error or noise, or require some huge sample of the superconductor.

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Re:Ferromagnetic half levitation of LK-99-like synthetic sam... by spiderfarmer on Tuesday August 08, 2023 @03:11AM (#37045537)

Zero resistance would be hard to proof this way, but why can't you compare measurements of LK99 with known conductors?

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Re:Ferromagnetic half levitation of LK-99-like synthetic sam... by foven on Tuesday August 08, 2023 @04:28AM (#37046090)

You absolutely can, and as you can see in this paper it is absolutely do-able to measure the resistance of these materials. They measure an insulator with something on the order of 10^6 ohm m. For reference, copper has a resistivity of ~ 10^(-8) ohm m, so there are about 14 orders of magnitude of difference. This does make the contact resistance pretty negligible in this case too.

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Re:Ferromagnetic half levitation of LK-99-like synthetic sam... by 1970-01-01 on Tuesday August 08, 2023 @11:01AM (#37050000)

I have the same thoughts. I think it's because they are not EEs and want to play with the material. A sensing resistor is trivial.

https://www.digikey.com/en/articles/fundamentals-of-current-...

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