Is La 3 Ni 2 O 6.5 a Bulk Superconducting Nickelate?

Superconducting states onsetting at moderately high temperatures have been observed in epitaxially stabilized NiO -based thin films. However, recently, it has also been reported that superconductivity at high temperatures is observed in bulk La Ni O at high pressure, opening further possibilities fo...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2024-02, Vol.16 (49), p.66857
Main Authors: Gao, Ran, Jin, Lun, Huyan, Shuyuan, Ni, Danrui, Wang, Haozhe, Xu, Xianghan, Bud'ko, Sergey L, Canfield, Paul, Xie, Weiwei, Cava, Robert J
Format: Article
Language:English
Subjects:
High pressure
MATERIALS SCIENCE
nickelates
superconductivity
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Summary:Superconducting states onsetting at moderately high temperatures have been observed in epitaxially stabilized NiO -based thin films. However, recently, it has also been reported that superconductivity at high temperatures is observed in bulk La Ni O at high pressure, opening further possibilities for study. Here we report the reduction profile of La Ni O in a stream of 5% H /Ar gas and the isolation of the metastable intermediate phase La Ni O , which is based on Ni . Although this reduced phase does not superconduct at ambient or high pressures, it offers insights into the Ni-327 system and encourages future study of nickelates as a function of oxygen content.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.3c17376