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Inspired by a recently proposed superconducting mechanism for a new cupratesuperconductor Ba$_2$CuO$_{3+\delta}$, we theoretically design anunconventional nickelate superconductor with $d^8$ electron configuration. Ourstrategy is to enlarge the on-site energy difference between $3d_{x^2-y^2}$ andother $3d$ orbitals by adopting halogens or hydrogen as out-of-plane anions, sothat the $3d$ bands other than $d_{x^-y^2}$ lie just below the Fermi level forthe $d^8$ configuration, acting as incipient bands that enhancesuperconductivity. We also discuss a possible relevance of the present proposalto the recently discovered superconductor (Nd,Sr)NiO$_2$.

Designing nickelate superconductors with $d^8$ configuration exploiting mixed-anion strategy