Critical role of hydrogen for superconductivity in nickelates

Nature, Published online: 01 March 2023; doi:10.1038/s41586-022-05657-2

In optimally doped Nd0.8Sr0.2NiO2H epitaxial film, combined state-of-the-art experimental and theoretical approaches show abundant hydrogen with zero resistivity, and its critical role in superconductivity in epitaxial infinite-layer nickelates.