The forum discussion centers on testing a newly developed superconductor, which reportedly exhibits near-zero resistance as measured by a Fluke 115 true RMS multimeter. Participants emphasize the necessity of using specialized 4-wire measurement techniques for accurate resistance readings and recommend seeking professional testing labs equipped for low-temperature measurements. The discussion also highlights the importance of understanding superconductivity principles, including the Meissner effect, which involves magnetic field expulsion. Users suggest contacting local universities or specialized labs for further testing and verification.
PREREQUISITESResearchers, physicists, and materials scientists interested in superconductivity, as well as anyone involved in experimental physics or materials testing.
You need 4W measurement to get close to that. For common multimeters and common measurements a measured zero resistance is rather about an ill-adjusted zero point...jedishrfu said:
You can try the 'quantum levitation' experiment. Not really a measurement, but for 'testing' it's good enough here, I think.auto_v said:
It is in California. Marketed mainly to field technicians. It's a good instrument for what it's designed to do, but it won't ever win the DMM Olympics.auto_v said:
Sorry, but it is.auto_v said:
Zero. They are zero, that's sort of the definition. That's the "super" part.auto_v said:
It is not capable of making 4-wire resistance measurements, which is what you need when measuring near-zero resistance. Are you familiar with 4-wire resistance measurements?auto_v said:
Since there are no room temperature superconductors yet, it seems likely that you will want to measure the sample's resistance versus temperature to find the critical temperature...auto_v said:
OK, I’ll say it. What is your superconductor material for kicks and giggles?auto_v said:
Please watch the profanity. Oh, wait...Delta Prime said:
I thought it was defined as BOTH expelling magnetic fields AND having zero resistance.Hornbein said:
Hmm, is there anything that expels magnetic fields that isn't superconductive? I dunno but had the idea that there wasn't.phinds said:
Doesn't really matter. What matters is that the definition of superconductivity is that it have zero resistance. I think the "expels magnetic fields" is just an addition, but in any case, it's BOTH.Hornbein said:
I don't think we have many PF members from Lithuania, but I just did a Google search on test labs with low temperature capability and got lots of hits for labs near me. Maybe try the same search to find labs near you.auto_v said:
Apologies…My understanding is a Fluke “0”auto_v said:
UK is a long way from Lithuania, no? That web page says that they only go down to -70C; what temperature range do typical superconductors work?auto_v said: