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133 Kelvin, about -140 Celsius. This is the critical temperature of a Mercury -based superconductor. It contains copper-oxide, a common theme, I believe, in high temperature superconductors

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Q: What is the highest critical temperature of superconductor?
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A superconductor performs best at what?

Low temperature. A superconductor doesn't 'perform' at all, and isn't even a superconductor, above its critical temperature.


What is The highest temperature at which superconductivity has been achieved?

Currently, the superconductor with the highest critical temperature ever recorded is Mercury Barium Thallium Copper Oxide or Hg0.2Tl0.8Ca2Cu3O, which has a critical temperature of 139 K at one atmosphere. This superconductor is a type of ceramic copper oxide and its critical temperature was determined in 1995 by Chakoumakos, Dai, Wong, Sun, Lu, and Xin. Apparently, metal-copper oxide ceramic superconductors have high critical temperatures, which might unlock the key of synthesizing a high temperature superconductor that is superconductive under room temperature conditions.


What flows indefinitely in a superconductor?

A current of electricity can flow at the same strength for an indefinitely long time in a superconductor but only for as long as the superconductor is held below its critical temperature. If its temperature were allowed to rise to its critical temperature - or higher - the material would no longer behave as a superconductor: it would acquire resistivity which would restrict the flow of current.


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A metal is said to be a superconductor if it has some resistance at room temperature, but when it is brought down to a critical temperature; i.e. to a very low temperature such as 20 K, it loses its resistivity completely. Also, a superconductor expels out any magnetic field inside of it that it had at room temperature, and is not affected by any further field applied to it at its cooler temperature.


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