= John Robert Schrieffer
{c}
{tag=Physicist}
{title2=1931–2019}
{wiki}
= J. Robert Schrieffer
{c}
{synonym}
= J. R. Schrieffer
{c}
{synonym}
= Robert Schrieffer
{c}
{synonym}
<John Robert Schrieffer> coauthored the microscopic <BCS theory> of conventional <superconductivity>. Its many-electron ground state coherently combines configurations in which states of opposite <spin> and <momentum> are paired. An attractive interaction mediated by lattice vibrations can lower the <energy> of this collective state, while its excitations have a gap. The theory relates that construction to a phase transition, specific heat, magnetic-field penetration and other measurable properties of a <superconductor>.<Theory of Superconductivity by John Bardeen and others>[Physical Review 108, 1175 (1957), paired ground state and observable predictions]{ref}
A <physicist>.<Professional profile of John Robert Schrieffer>[Independent professional profile]{ref}
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{title=Portrait of <John Robert Schrieffer>}
{description=Unknown author; Nationaal Archief / Spaarnestad Photo, ANEFO collection. https://creativecommons.org/licenses/by-sa/3.0/nl/[CC BY-SA 3.0], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:John_Robert_Schrieffer_1972.jpg}
{width=260}
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