Journal
PHYSICAL REVIEW B
Volume 108, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.108.174512
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A recent experiment suggests that superconductivity in nickelates is limited to a specific range of hydrogen concentration. The necessity of hydrogen indicates its crucial role in superconductivity. However, calculations using density-functional theory show that the electron-phonon coupling in hydrogen-intercalated nickelates is not strong enough to explain the observed superconductivity.
A recent experiment [X. Ding et al., Nature (London) 615, 50 (2023)] indicates that superconductivity in nickelates is restricted to a narrow window of hydrogen concentration, 0.22 < x < 0.28 in Nd0.8Sr0.2NiO2Hx. This reported necessity of hydrogen suggests that it plays a crucial role for superconductivity, as it does in the vast field of hydride superconductors. Using density-functional theory and its extensions, we explore the effect of topotactic hydrogen on the electronic structure and phonon-mediated superconductivity in nickelate superconductors. Our calculations show that the electron-phonon coupling in hydrogen-intercalated nickelates is not strong enough to drive the electron pairing, and thus cannot explain the reported superconductivity.
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