This article discusses a major breakthrough in superconductivity research, highlighting the discovery of a superconducting state with a critical temperature around 40 K in nickel oxide films. This development is particularly significant as it occurs under ambient pressure and without lattice compression, contrary to previous findings in copper-based cuprates. The superconductivity is evidenced by zero resistance at 31 K and displays characteristics of high-temperature superconductivity using d-electron metal oxides, paving the way for future research and understanding of Cooper pairing without copper as a component.
The discovery of superconductivity in the Ba-La-Cu-O system marked a breakthrough, inspiring extensive explorations in oxide-based layered superconductors to identify electron pairing with higher critical temperatures.
Despite observations of superconductivity in nickelates, evidence of Cooper pairing above 30 K in isostructural systems to cuprates without copper has been elusive under ambient pressure.
We report superconductivity with a Tc approaching 40 K under ambient pressure in d9-x hole-doped nickel oxide thin films, demonstrating a zero resistance state at 31 K.
Our findings show the potential for high-temperature superconductivity using strongly correlated d-electron metal oxides, offering a promising platform for further exploration of Cooper pairing.
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