Antiferromagnetism in Ni‐Based Superconductors
Xiaorong Zhou, Xiaowei Zhang, Jiabao Yi, Peixin Qin, Zexin Feng, Peiheng Jiang, Zhicheng Zhong, Han Yan, Xiaoning Wang, Hongyu Chen, Haojiang Wu, Xin Zhang, Ziang Meng, Xiaojiang Yu, Mark B. H. Breese, Jiefeng Cao, Jingmin Wang, Chengbao Jiang, Zhiqi Liu
Abstract
Abstract Due to the lack of any magnetic order down to 1.7 K in the parent bulk compound NdNiO 2 , the recently discovered 9–15 K superconductivity in the infinite‐layer Nd 0.8 Sr 0.2 NiO 2 thin films has provided an exciting playground for unearthing new superconductivity mechanisms. Herein, the successful synthesis of a series of superconducting Nd 0.8 Sr 0.2 NiO 2 thin films ranging from 8 to 40 nm is reported. The large exchange bias effect is observed between the superconducting Nd 0.8 Sr 0.2 NiO 2 films and a thin ferromagnetic layer, which suggests the existence of the antiferromagnetic order. Furthermore, the existence of the antiferromagnetic order is evidenced by X‐ray magnetic linear dichroism measurements. These experimental results are fundamentally critical for the current field.