Anthony J. Leggett held his Nobel Lecture December 8, 2003, at Aula Magna, Stockholm University. He was presented by Professor Mats Jonson, Chairman of the Nobel Committee for Physics. Summary: Helium exists in two stable forms: the normal Helium-4 with two neutrons and two protons, and Helium-3 with one neutron and two protons. The two show very different superconducting properties at very low temperatures. The anomalous superfluidity of Helium-3 is explained using the principles of quantum mechanics. An analogy between ferro-magnets and liquid Helium-3 is used to explain the theory of superfluid Helium-3.
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The Nobel Prize in Physics 2003 Lecture (pdf)