Is La3Ni2O6.5 a Bulk Superconducting Nickelate?

Abstract

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 the future study of nickelates as a function of oxygen content.

References in corpus (8)

• Superconductivity near 80 Kelvin in single crystals of La3Ni2O7 under pressure
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• Stacked Charge Stripes in Quasi-Two_Dimensional Trilayer Nickelate La4Ni3O8
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• Structure and magnetic properties of the $S=3/2$ zigzag spin chain antiferromagnet BaCoTe${}_2$O${}_7$

Cited by in corpus (4)

• Phase diagram of pressure-induced high temperature superconductor La${}_3$Ni${}_2$O${}_{7+\delta }$
• Intertwined charge and spin instability of La${}_3$Ni${}_2$O${}_7$
• Unveiling the multiband metallic nature of the normal state in nickelate La3Ni2O7
• Variational Quantum Monte Carlo investigations of the superconducting pairing in La${}_3$Ni${}_2$O${}_7$