Mind the pseudogap

摘要

The discovery of predicted collective electronic behaviour in copper-oxide superconductors in the non-superconducting state provides clues to unlocking the 24-year-old mystery of high-temperature superconductivity. rnThe phenomenon of high-temperature superconductivity is a beautiful and well-posed scientific problem with many facets. On page 283 of this issue, Li et al. report observing a special kind of intense collective electronic fluctuation in the most mysterious phase of matter exhibited by high-temperature superconducting copper-oxide materials (cuprates).