Nickelate superconductors: infinite-layer and bilayer families
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.
Why it matters
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-$T_{\mathrm{c}}$ pairing.
Review
H. Sun et al., Signatures of superconductivity near 80 K in a nickelate under high pressure, Nature, 2023. https://doi.org/10.1038/s41586-023-06408-7 reference checked
Proof
- Signed record
- 1addbb797485…
- Public log
- Entry 159, in checkpoint 2,123
- Bitcoin date
- Block 969,698, 2026-10-03