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Nature 422, 569-570 (10 April 2003) | doi:10.1038/422569a
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Superconductivity: Pebbles in the nodal pond
Jan Zaanen
Abstract
Rippling patterns of electron waves in a copper oxide match the expectation for a certain kind of excitation — another step towards understanding why copper oxides superconduct at far higher temperatures than other materials.
Perhaps the first image that comes to mind when thinking about waves is the interference pattern on the surface of a pond after some pebbles are thrown in. According to quantum physics, electrons can behave like waves, and so give rise to similar phenomena: the 'pebbles' are imperfections in the medium, scattering the electron waves, and the 'ripples', or interference fringes, can be seen through a scanning tunnelling microscope (STM).
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