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Nature 427, 692 (19 February 2004) |
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Superconductivity: Shine a light
Michael Norman1
Abstract
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.
- Michael Norman is at the Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
Email: norman@anl.gov
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