|Jul10-12, 08:02 AM||#1|
superconductors and best conductors...
gold, silver, copper are the best electrical conductors are room temperature. But they cannot be superconductors: there is no finite, low critical temperature at which they become superconductors...
But what if we could bring their temperature to 0 kelvin? I believe that all metals become superconductors (R=0) at o kelvin, correct?
All materials? Even insulators, can be become superconductors at 0 k?
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|Jul10-12, 08:06 AM||#2|
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One needs to look at the Meissner effect, and the different between a diamagnet and perfect diamagnet. It is clearly manifested when cooling in a magnetic field.
BTW, most metals do not have zero resistance at T=0. There is something called residual resistivity that starts to creep up as one gets very close to 0K.
|Jul10-12, 10:11 AM||#3|
Ok, thanks, I see.
So silver does not have a critical temperature and it may not even have zero resistivity at T=0 K.....
As far as the current flowing in superconductors go: I think the current can only be a surface current, regardless of it being DC or AC...
Is that correct? If so, why?
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