Is La3Ni2O6.5 a Bulk Superconducting Nickelate?

Ran Gao, Lun Jin, Shuyuan Huyan, Danrui Ni, Haozhe Wang, Xianghan Xu, Sergey L. Bud’ko, Paul Canfield, Weiwei Xie, Robert J. Cava

Research output: Contribution to journalReview articlepeer-review


Superconducting states onsetting at moderately high temperatures have been observed in epitaxially stabilized RENiO2-based thin films. However, recently, it has also been reported that superconductivity at high temperatures is observed in bulk La3Ni2O7-δ at high pressure, opening further possibilities for study. Here we report the reduction profile of La3Ni2O7 in a stream of 5% H2/Ar gas and the isolation of the metastable intermediate phase La3Ni2O6.45, which is based on Ni2+. 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.

Original languageEnglish (US)
JournalACS Applied Materials and Interfaces
StateAccepted/In press - 2023

All Science Journal Classification (ASJC) codes

  • General Materials Science


  • High pressure
  • nickelates
  • superconductivity


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