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Critical role of hydrogen for superconductivity in nickelates - Nature
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The newly discovered nickelate superconductors so far only exist in epitaxial thin films synthesized by a topotactic reaction with metal hydrides1. This method changes the nickelates from the perovskite to an infinite-layer structure by deintercalation of apical oxygens1–3. Such a chemical reaction may introduce hydrogen (H), influencing the physical properties of the end materials4–9.
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