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.
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Zaanen, J. Pebbles in the nodal pond. Nature 422, 569–570 (2003). https://doi.org/10.1038/422569a
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DOI: https://doi.org/10.1038/422569a