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Nature 427, 692 (19 February 2004) |

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Superconductivity: Shine a light

Michael Norman1

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Copper oxides superconduct at unusually high temperatures. New evidence from optical studies highlights the nature of the many-body interactions involved.

Throughout the history of superconductivity, optical spectroscopy — through the scattering of light by a material — has been a vital tool. It was the existence of a gap in the excitation-energy spectrum of electrons, first observed in optical studies, that set Bardeen on the path to the celebrated Bardeen–Cooper–Schrieffer theory of superconductivity.

  1. Michael Norman is at the Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
    Email: norman@anl.gov

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