Superconducting Dome in La3−xSrxNi2O7−δ Thin Films
Maosen Wang, Bo Hao, Wenjie Sun, Shengjun Yan, Shengwang Sun, Hongyi Zhang, Zhengbin Gu, Yuefeng Nie
DOI 10.1103/qrkk-l2ng · Physical Review Letters
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Abstract
The ambient-pressure superconductivity in La3Ni2O7 thin films via compressive epitaxial strain provides a highly accessible platform for diverse characterization techniques, facilitating the studies of high-temperature superconductivity. Here, we systematically map the phase diagram and reveal the superconducting dome with an electron-hole crossover in compressively strained La3−xSrxNi2O7−δ thin films by simultaneously tuning Sr doping and oxygen content. The maximum transition temperature (Tc) coincides with an anomalous sign change in the Hall coefficient (RH), reminiscent of electron-doped cuprates, which may signal a Fermi surface reconstruction. Beyond the superconducting dome, a ln1/T insulating regime and a T-linear resistivity regime are also resolved, resembling behaviors observed in cuprates and infinite-layer nickelates. This work reveals a dome-shaped relationship between Tc and RH and establishes a key framework for understanding unconventional superconductivity in nickelate systems.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La3-xSrxNi2O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | onset |
| La2.79Sr0.21Ni2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | onset |
| La2.85Pr0.15Ni2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La3Ni2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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