How do materials that are normally insulators manage to conduct electricity without resistance? Physicists have been debating this basic question about cuprates – ceramic compounds made up of layers of copper and oxygen atoms, interleaved with atoms of other elements – for more than three decades and have yet to come up with a satisfactory answer. Now, however, researchers in the US have put forward a model that at least provides clues as to what such an answer might look like, based on studies of so-called “overdoped” cuprates.
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