Stabilizing and Tuning Superconductivity in La${}_3$Ni${}_2$O${}_{7-\hat{I}´}$ Films: Oxygen Recycling Protocol Reveals Hole-Doping Analogue

Abstract

The recent achievement of superconductivity in La${}_3$Ni${}_2$O${}_{7-\hat{I}´}$ with transition temperatures exceeding 40 K in thin films under compressive strain and 80 K in bulk crystals under high pressure opens new avenues for research on high-temperature superconductivity. The realization of superconductivity in thin films requires delicate control of growth conditions, which presents significant challenges in the synthesis process. Furthermore, the stability of superconducting La${}_3$Ni${}_2$O${}_{7-\hat{I}´}$ films is compromised by oxygen loss, which complicates their characterization. We introduce an effective recycling protocol that involves oxygen removal in a precursor phase followed by ozone-assisted annealing, which restores superconducting properties. By tuning the oxygen content, we construct an electronic phase diagram that highlights oxygen addition as a potential analogue to hole doping via La substitution with Sr, providing insights into the doping mechanism and guiding future material optimization.

References in corpus (2)

• Bulk superconductivity up to 96 K in pressurized nickelate single crystals
• Charge distribution and magnetism in bilayer La${}_3$Ni${}_2$O${}_7$: a hybrid functional study

Cited by in corpus (1)

• Compressive Strain Turns $s^{\pm }$ into $d$-Wave Pairing in One-unit-cell La${}_3$Ni${}_2$O${}_7$ Thin Film Via Substrate-Induced Hole Doping