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Sun et al., Signatures of superconductivity near 80 K in a nickelate under high pressure, Nature, 2023","review_link":"https://doi.org/10.1038/s41586-023-06408-7","review_verified":"true","summary":"Nickel oxides built like cuprates also superconduct: infinite-layer films such as Nd0.8Sr0.2NiO2 below about $15\\,\\mathrm{K}$ (near $40\\,\\mathrm{K}$ in samarium-based films), and bilayer La3Ni2O7 near $80\\,\\mathrm{K}$ under about $140\\,\\mathrm{kbar}$ (up to about $96\\,\\mathrm{K}$ in 2025 reports), with onset above $60\\,\\mathrm{K}$ in compressed thin films at normal pressure. Why they superconduct, and how high the transition temperature $T_c$ can go, are open questions.","title":"Nickelate superconductors: infinite-layer and bilayer families","topic_ref":null,"why":"They are the closest chemical relatives of the cuprates and a second family with $T_{\\mathrm{c}}$ above 77 K, so comparing them separates generic from material-specific features of high-$T_{\\mathrm{c}}$ 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