2026年7月17日 Jun Zhan: A Unified Scenario of Superconductivity and Magnetism in High-Tc Multilayer Nickelates

A Unified Scenario of Superconductivity and Magnetism in High-Tc Multilayer Nickelates

Jun Zhan
Nagoya University

2026/7/17 13:00~ Science Hall 614

The discovery of high-temperature superconductivity in multilayer Ruddlesden--Popper (RP) nickelates has sparked tremendous research interest. Combining first-principles calculations with functional renormalization group analysis, we investigate the electronic structures and ordering instabilities of bulk and thin-film multilayer RP nickelates. We show that spin fluctuations with interlayer antiferromagnetic correlations, driven by particle-hole scattering between states of opposite mirror parity, dominate the low-energy instabilities. In bilayers nickelate La₃Ni₂O₇, an additional bonding band suppresses spin density wave (SDW) order through competing spin fluctuations while promoting interlayer spin-singlet s_± pairing between bonding and antibonding bands. This pairing is further enhanced by out-of-plane electron-phonon coupling and realistic interlayer Coulomb repulsion. In trilayer nickelate La₄Ni₃O₁₀, the exotic mirror-odd SDW naturally arises from scattering between mirror-even and mirror-odd Fermi pockets. Our results establish a unified itinerant picture of superconductivity and magnetism governed by fermiology and layer symmetry for RP nickelates.