Levitating superconductor
Credit: S J Blundell

In Our Time: Superconductivity

Research group

Stephen Blundell was one of the guests on the BBC Radio 4 programme In Our Time broadcast on Thursday 26 January 2023.

Melvyn Bragg and guests discuss the discovery made in 1911 by the Dutch physicist Heike Kamerlingh Onnes (1853-1926). He came to call it Superconductivity and it is a set of physical properties that nobody predicted and that none, since, have fully explained. When he lowered the temperature of mercury close to absolute zero and ran an electrical current through it, Kamerlingh Onnes found not that it had low resistance but that it had no resistance. Later, in addition, it was noticed that a superconductor expels its magnetic field. In the century or more that has followed, superconductors have already been used to make MRI scanners and to speed particles through the Large Hadron Collider and they may perhaps bring nuclear fusion a little closer (a step that could be world changing).

Melvyn's guests were: Nigel Hussey (Professor of Experimental Condensed Matter Physics at the University of Bristol and Radbout University), Suchitra Sebastian (Professor of Physics at the Cavendish Laboratory at the University of Cambridge) and Stephen Blundell (Professor of Physics at the University of Oxford and Fellow of Mansfield College).