Sir Anthony Leggett, physicist who won the Nobel Prize for his research into superfluids – obituary
Explaining how the unwieldy Helium-3 atoms combined with each other posed a much harder challenge for theoretical physics, and it was Leggett who, working at Sussex University, succeeded in explaining how this occurs. The atoms, Leggett suggested, first form into pairs, which then act like single particles that can occupy the same quantum state. Scientists