Stabilizing and tuning superconductivity in La3Ni2O7−δ films: Oxygen recycling protocol reveals hole-doping analogue
Lifen Xiang, Siyi Lei, Xiaolin Ren, Ziao Han, Zijian Xu, X. J. Zhou, Zhihai Zhu
DOI 10.1103/h9ls-y4s7 · Physical Review B
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Abstract
The recent achievement of superconductivity in La3Ni2O7−δ 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 La3Ni2O7−δ 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 analog to hole doping via La substitution with Sr, providing insights into the doping mechanism and guiding future material optimization.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La3Ni2O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | 14 GPa | unknown |
| La3Ni2O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure unresolved | onset |
| La3Ni2O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 42 | Pressure unresolved | onset |
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