Paper

Superconducting phase diagram of multi-layer square-planar nickelates

TenHuisen, Sophia F R, Brooks, Charles M, Pan, Grace A, Dean, Mark P M, Pelliciari, Jonathan, Dan Ferenc Segedin, Ke-Jin, Zhou, Muller, David A, Turkiewicz, Ari B, Song, Qi, Agrestini, Stefano, Jiang, Abigail Y, Kourkoutis, Lena F, Bhatt, Lopa, Zhou, Hua, Mundy, Julia A, Nag, Abhishek, Baykusheva, Denitsa R, Botana, Antia S, Mitrano, Matteo, Paik, Hanjong, Bisogni, Valentina, Harrison LaBollita, Goodge, Berit H

2026

Overview

The discovery of superconductivity in square-planar nickelates has offered a rich materials platform to explore the origins of cuprate-like superconductivity. Experimental investigations however have largely been limited to the infinite-layer \\(R\\)NiO\\(_2\\) (\\(R\\)=rare-earth) nickelates. Here, we construct a phase diagram of multi-layer square-planar Nd\\(_{n+1}\\)Ni\\(_n\\)O\\(_{2n+2}\\) compounds and discover signatures of superconductivity for \\(n\\) = 4 - 8. Upon decreasing the dimensionality \\(n\\), the superconducting anisotropy evolves due to 4\\(f\\) electron effects, and electronic structure characteristics approach cuprate-like behavior. Magnetic fluctuations persist from within the superconducting regime and into the over-doped, non-superconducting regime. Remarkably, the superconducting regime overlaps with that of chemically-doped infinite-layer nickelates, demonstrating underlying commonalities and distinct differences across varying structural realizations of square-planar nickelates. Our work establishes this layered template for creating new nickel-based superconductors.

• Publisher: Cornell University Library, arXiv.org
• Subject: Anisotropy / Electronic structure / Magnetic variations / Multilayers / Phase diagrams / Rare earth elements / Superconductivity / Superconductors