In 1986 high temperature superconductors were born. A moving electron is flying compared to the motion of the heavier ions. Once the passing electron has moved sufficiently far away the d orbitals pop back into place. When the superconductor is heated up above its critical temperature the Cu atoms vibrate meaning that the electron is passed all over the place. The oxidation state of the oxygen can also explain superconductivity, although I'm not certain how.
Superconductivity occurs when certain inorganic compounds are doped with alien metals.
Superconductivity, is a phenomenon, where at a certain critical temperature, Tc, some compounds' resistance, to the passage of current, through them, falls to zero. Once the graph went to zero, no more points were taken as this was pointless. This causes the electron to bulge toward the ion. Then the graph was built up and smoothened out. Understanding of superconductors is becoming more and more, and with it the critical temperatures are becoming higher and higher, and thus the use of superconductors in everyday life is becoming more and more.