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Seminario | 17 settembre 2025

Universal electronic structure of layered nickelates via oxygen-centered planar orbitals

Brescia

Andrea DAMASCELLI
Quantum Matter Institute, UBC, Vancouver, Canada
Physics & Astronomy Department, UBC, Vancouver, Canada

Abstract:
Superconductivity in La3Ni2O7 has been reported up to 91 K under pressure and 48 K in strained films, but the underlying structural and electronic mechanisms remain unclear. By comparing natural stacking variants in bulk crystals and using ARPES, we find a robust spin-density-wave signature that links surface and bulk probes and highlights a close connection between magnetism and the Fermi surface across related nickelates. Modeling and dichroism data show the low-energy states are dominated by oxygen-centered planar orbitals whose character changes along the Fermi surface, revealing an empirical similarity to cuprates and suggesting a common route to unconventional superconductivity.

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