Antiferromagnetism in Ni-Based Superconductors.
basic_science · Level V
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- Record sourced from PubMed, PMID 34706110.
- Also identified by DOI 10.1002/adma.202106117.
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Abstract
Due to the lack of any magnetic order down to 1.7 K in the parent bulk compound NdNiO<sub>2</sub> , the recently discovered 9-15 K superconductivity in the infinite-layer Nd<sub>0.8</sub> Sr<sub>0.2</sub> NiO<sub>2</sub> thin films has provided an exciting playground for unearthing new superconductivity mechanisms. Herein, the successful synthesis of a series of superconducting Nd<sub>0.8</sub> Sr<sub>0.2</sub> NiO<sub>2</sub> thin films ranging from 8 to 40 nm is reported. The large exchange bias effect is observed between the superconducting Nd<sub>0.8</sub> Sr<sub>0.2</sub> NiO<sub>2</sub> 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.