Current champion

2019-03-07 07:02:01

By Melanie Cooper IN THE 1980s, “high-temperature superconductors” promised everything from magnetically levitating trains to resistance-free power lines and cheap MRI scanners. They have failed to deliver largely because they could not carry enough current. Now a new material will not only do the key trick of conducting with zero resistance but has overtaken its rivals on the amount of current it can carry. The abilities of the new material, magnesium diboride (MgB2),