Photo from the Nobel Foundation archive.
Leon Neil Cooper
Born: 28 February 1930, New York, NY, USA
Affiliation at the time of the award: Brown University, Providence, RI, USA
Prize motivation: "for their jointly developed theory of superconductivity, usually called the BCS-theory."
Prize share: 1/3
When certain metals are cooled to extremely low temperatures, they become superconductors, conducting electrical current entirely without resistance. Based on quantum mechanics, Leon Cooper, John Bardeen, and Robert Schrieffer formulated a theory for the phenomenon in 1957. At extremely low temperatures, the interaction between electrons and atoms in the metals' crystalline structure causes the electrons to pair up with one another. As a result, their movement becomes orderly, unlike the random movement at normal temperatures, and electrical resistance disappears.