Superconductivity is a quantum mechanical phenomenon of in which charge can be transported with exactly zero electrical resistance. In addition, magnetic fields are expelled from certain superconducting materials when cooled below a characteristic critical temperature. This means no heat, sound or any other form of energy would be released from the material when it has reached the temperature at which the material becomes superconductive
Most materials must be extremely cold in order to become superconductive. Research is underway to develop compounds that become superconductive at higher temperatures.
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Figure: Scanning Electron Microscope (SEM) image of an array of ~ 100 intrinsic Josephson junctions in a thin film of an oxide high-temperature superconductor. The structure was fabricated using focussed-ion-beam milling. [courtesy Paul Warburton]