镍氧化物超导研究--非常规高温超导研究的重要启示

Nickelate superconductors——important inspiration for unconventional high-temperature superconductivity

最近几年,镍基氧化物超导材料方面的研究进展吸引了广大科研工作者的密切关注,其原因是镍基超导的母体RNi O2(R为稀土元素)与铜氧化物高温超导母体之一Ca Cu O2具有相似的晶体结构,而且其最外层轨道电子排布(3d^(9))与众多的铜氧化物超导体的母体相似。因此,对相关镍氧化物进行深入的探索和研究,可以帮助我们进一步理解非常规高温超导的物理起源。文章对近年来镍基超导材料的发展进行了概述,主要包括镍基薄膜中超导电性的发现;112相的晶体结构和电子结构;薄膜生长条件的优化及相关研究进展和相图。最后,对镍基超导材料的发展给出简要总结和展望。

In recent years,superconductivity in nickelates has attracted much attention because the infinite layer nickelates RNiO_(2)(R represents rare-earth element)have the same crystal structure and 3d^(9 )outer-shell electronic orbital as CaCuO_(2),a parent phase of high-temperature cuprate superconductors.Therefore,further study and analysis of nickelates can help us understand the physical origin of unconventional high-temperature superconductivity.This paper will review the current development of nickelate superconductors,mainly covering the discovery of superconductivity in nickelate thin films,the crystal and electronic structure of the 112 phase,the optimization of thin film growth conditions,recent research progress and phase diagram.Finally,a brief summary and future perspectives are presented.