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Superconductivity in iron selenide is very sensitive to any dopants at levels of only a few percent. Here, we demonstrate how iron substitution by copper destroys superconductivity in FeSe, and argue why superconductivity reemerges under pressure. Detailed Mössbauer spectroscopy studies on 57Fe-enriched Cu0.04Fe0.97Se reveal that at low temperatures part of the iron sites is magnetically ordered,...
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