If the electrical resistance of a typical substance suddenly drops to zero, then the substance is called :
In superconductors, resistance drops suddenly to zero at a sufficiently low temperature. • A superconductor is a material that achieves superconductivity, which is a state of matter that has no electrical resistance and does not allow magnetic fields to penetrate. • An electric current in a superconductor can persist indefinitely. • Superconductivity can only typically be achieved at very cold temperatures. • Prominent examples of superconductors include aluminum, niobium, magnesium diboride, cuprates such as yttrium barium copper oxide and iron pnictides. • These materials only become superconducting at temperatures below a certain value, known as the critical temperature.
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