Team makes progress on high-temperature superconductors

The team at Cornell University identified gaps in the energy levels of electrons thought to represent electrons that have paired up with twins from adjacent atoms to form so-called ‘Cooper pairs’ that move through the conductor without interference.

Superconductivity was first discovered in metals cooled to temperatures very near absolute zero. Recently discovered compounds of iron, arsenic and other elements become superconductors at much higher temperatures, offering a possible new route to room-temperature superconductivity.

The key lies in ‘spin’. Just as current rotating in a coil of wire generates a magnetic field, a spinning electron is thought to generate a tiny field, which physicists refer to as spin. It is believed that Cooper pairs form when two electrons with opposite spins join up, analogous to two bar magnets snapping together with their north and south poles meeting. The pair is magnetically neutral, so it can move without being impeded by the magnetic fields of other particles.