All Class Clips content is available to watch on mobile, tablet and desktop devices on our new Knowledge & Learning BETA website.
Superconductors and the Meissner effect
Mark Miodownik describes how, following the discovery of superconductivity in 1911, scientists researched other materials in an attempt to raise the critical temperature, below which superconductivity occurs. He uses a piece of yttrium barium copper oxide (a ceramic) that exhibits superconductivity when cooled using liquid nitrogen at -196 degrees Celcius. The Meissner effect is seen, with Mark levitating a magnet above the piece of ceramic. He explains this phenomenon using an animation of the induced current and the repulsion between the two fields. The potential for superconductors in power transmission is then discussed. First broadcast in the Learning Zone on BBC2 in May 2012 as part of the programme Materials: How They Work.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.