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Superconducting states onsetting at moderately high temperatures have beenobserved in epitaxially-stabilized RENiO2-based thin films. However, recentlyit has also been reported that superconductivity at high temperatures isobserved in bulk La3Ni2O7-{\delta} at high pressure, opening furtherpossibilities for study. Here we report the reduction profile of La3Ni2O7 in astream of 5% H2/Ar gas and the isolation of the metastable intermediate phaseLa3Ni2O6.45, which is based on Ni2+. Although this reduced phase does notsuperconduct at ambient or high pressures, it offers insights into the Ni-327system and encourages the future study of nickelates as a function of oxygencontent.

Is La3Ni2O6.5 a Bulk Superconducting Nickelate?