Time- and angle-resolved photoemission shows that intense light disrupts superconductivity in an optimally doped bismuth-based cuprate and exposes a cold, asymmetric pseudogap-like electronic state.
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What limits superconductivity in certain copper oxides? A new experiment shows that a mysterious electronic state can counteract the superconducting order. A laser pulse makes the so-called pseudo gap temporarily visible, although the material is sufficiently cold. When superconductivity recreates, the additional signal disappears. However, at times characteristics of both states can be observed simultaneously. Varennes (Canada). [...] The artic…