方平面镍酸盐中超导性的发现，为探索高温超导的起源提供了一个丰富的材料平台。然而，实验研究在很大程度上局限于无限层结构的RNiO2（R为稀土元素）镍酸盐。
研究组构建了多层方平面Ndn+1NinO2n+2化合物的相图，并发现了维度n = 4至8的超导特征。随着n减小，超导各向异性因4f电子效应而演化，电子结构特征趋近于类铜酸盐行为。磁涨落在超导区以及过掺杂的非超导区均持续存在。超导区与化学掺杂的无限层镍酸盐区重叠，表明方平面镍酸盐在不同结构实现形式之间既存在共性，也存在差异。该工作为创建新型镍基超导体建立了多层模板。
附：英文原文
Title: Superconducting phase diagram of multilayer square-planar nickelates
Author: Grace A. Pan, Dan Ferenc Segedin, Sophia F. R. TenHuisen, Lopa Bhatt, Harrison LaBollita, Abigail Y. Jiang, Qi Song, Ari B. Turkiewicz, Denitsa R. Baykusheva, Abhishek Nag, Stefano Agrestini, Ke-Jin Zhou, Jonathan Pelliciari, Valentina Bisogni, Hua Zhou, Mark P. M. Dean, Hanjong Paik, David A. Muller, Lena F. Kourkoutis, Charles M. Brooks, Matteo Mitrano, Antia S. Botana, Berit H. Goodge, Julia A. Mundy
Issue&Volume: 2026-06-25
Abstract: The discovery of superconductivity in square-planar nickelates has offered a rich materials platform to explore the origins of high-temperature superconductivity. However, experimental investigations have largely been limited to the infinite-layer RNiO2 (R, rare earth) nickelates. We constructed a phase diagram of multilayer square-planar Ndn+1NinO2n+2 compounds and found signatures of superconductivity for dimensionality n = 4 to 8. Upon decreasing n, the superconducting anisotropy evolves owing to 4f electron effects, and electronic structure characteristics approach cuprate-like behavior. Magnetic fluctuations persist from within the superconducting regime and into the overdoped, nonsuperconducting regime. The superconducting regime overlaps with that of chemically doped infinite-layer nickelates, demonstrating underlying commonalities as well as differences across varying structural realizations of square-planar nickelates. Our work establishes this layered template for creating new nickel-based superconductors.
DOI: adp4440
Source: https://www.science.org/doi/10.1126/science.adp4440