1. Anthony J. Leggett is in the Department of Physics and Center for Advanced Study, University of Illinois at Urbana–Champaign, Urbana, Illinois 61801–3080, USA. e-mail: aleggett@uiuc.edu

Abstract

From twenty years of experimental research, we can draw several conclusions that do not depend on any particular model of high-temperature superconductivity. With these in mind, it's time to assess the theoretical landscape, and wonder whether we have been asking the right questions.

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