Superconductivity in an infinite-layer nickelate superlattice

Wen Xiao, Zhan Yang, Shilin Hu, Yuzhou He, Xiaofei Gao, Junhua Liu, Zhixiong Deng, Yuhao Hong, Long Wei, Lei Wang, Ziyue Shen, Tianyang Wang, Lin Li, Yulin Gan (), Kai Chen (), Qinghua Zhang () and Zhaoliang Liao ()
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Wen Xiao: University of Science and Technology of China
Zhan Yang: University of Science and Technology of China
Shilin Hu: University of Science and Technology of China
Yuzhou He: Chinese Academy of Sciences
Xiaofei Gao: University of Science and Technology of China
Junhua Liu: University of Science and Technology of China
Zhixiong Deng: University of Science and Technology of China
Yuhao Hong: University of Science and Technology of China
Long Wei: University of Science and Technology of China
Lei Wang: University of Science and Technology of China
Ziyue Shen: University of Science and Technology of China
Tianyang Wang: University of Science and Technology of China
Lin Li: University of Science and Technology of China
Yulin Gan: University of Science and Technology of China
Kai Chen: University of Science and Technology of China
Qinghua Zhang: Chinese Academy of Sciences
Zhaoliang Liao: University of Science and Technology of China

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Recent observations of superconductivity in infinite-layer nickelates offer insights into high-temperature superconductivity mechanisms. However, defects and dislocations in doped films complicate the realization of superconductivity, limiting current research to superconducting nickelate heterostructures. The lack of research on superconductivity in superlattices composed of ultrathin nickelates severely impedes not only the exploration of the interface effect on superconductivity, but also the utilization of heterostructure engineering for exploring higher superconducting temperature Tc. Here, we demonstrated superconducting infinite-layer nickelate superlattices [(Nd0.8Sr0.2NiO2)8/(SrTiO3)2]10 via topotactic reduction. Our study uncovered that only above a critical thickness can high-quality superlattices be achieved, with structural formation dependent on nickelate layer thickness. The superconducting superlattice showed a Tc of 12.5 K and a 2D superconducting feature, indirectly indicate the intrinsic superconductivity of infinite-layer nickelates. Our study offers promising avenues for delving into the superconducting mechanism and for exploring multilevel interface engineering of infinite-layer nickelates, thus opening new horizons for the study of infinite-layer nickelates.

Date: 2024
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DOI: 10.1038/s41467-024-54660-w

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