= Anthony Leggett
{c}
{tag=Physicist}
{title2=1938–2026}
{wiki}
= Anthony James Leggett
{c}
{synonym}
= Anthony J. Leggett
{c}
{synonym}
= A. J. Leggett
{c}
{synonym}
= Tony Leggett
{c}
{synonym}
<Anthony Leggett> developed a theoretical account of the newly discovered <superfluid> phases of <helium-3>. Unlike <helium-4> atoms, <helium-3> atoms are <fermions>, so their <superfluid> state involves correlated pairing. The internal <spin> and orbital structure of the pairs allows several distinct ordered phases. His account connected this structure with unusual <nuclear magnetic resonance> observations, using magnetic response to distinguish possible forms of the condensate. The work illustrates how a small interaction can make the internal symmetry of a <quantum fluid> experimentally visible.<Nobel Lecture: Superfluid 3He: the early days as seen by a theorist by Anthony James Leggett>[Nobel lecture, theoretical interpretation of pairing and NMR observations in 1972–1973]{ref}
A <physicist> who studied <superfluidity> and macroscopic <quantum mechanics> at Illinois.<Tony Leggett, Nobel laureate and theoretical physicist, dies by Lois Yoksoulian>[Independent professional identity]{ref}
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{title=Portrait of <Anthony Leggett>}
{description=Kenneth C. Zirkel; existing Commons crop by Wabbuh. https://creativecommons.org/licenses/by-sa/3.0/[Creative Commons Attribution-ShareAlike 3.0 Unported.], via Wikimedia Commons.}
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