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对于双层Ruddlesden-Popper相镍酸盐La3Ni2O7,近期的实验研究表明,在超导区，随着压力增大,其超导转变温度从18 GPa压力下的83 K单调下降,表现出近直角三角形的超导转变温度-压力相图,与铜氧化物超导体和铁基超导体中掺杂或压力下的穹顶形超导相图不同.解释该反常相图对揭示La3Ni2O7的超导机制至关重要.由于电声耦合机制无法解释镍基超导体的高超导转变温度,因此,本文从巡游电子和局域自旋图像出发,探讨超导转变温度的压力依赖性.通过将理论结果与实验结果进行对比,为揭示其超导机制提供线索.Recent experimental studies on the bilayer Ruddlesden-Popper phase nickelate La3Ni2O7 have revealed that in the superconducting region， its superconducting transition temperature decreases monotonically from 83 K at 18 GPa with increasing pressure, exhibiting a nearly right-triangular superconducting transition temperature-pressure phase diagram distinct from the dome-shaped diagrams observed in cuprates and iron-based superconductors under doping or pressure. Understanding this anomalous phase diagram is crucial for elucidating the superconducting mechanism of La3Ni2O7. Since the electron-phonon coupling mechanism cannot account for the high superconducting transition temperatures in nickelate superconductors, this study investigates the pressure dependence of the transition temperature from the perspective of itinerant electrons picture and local spin picture. By combining the density functional theory (DFT) and the unbiased singular-mode functional renormalization group (SM-FRG) method, we find the pairing symmetry is consistently an s±-wave triggered by spin fluctuations which become increasingly weakened by pressure and consequently lead to decreasing superconducting transition temperature, in qualitative agreement with the experiment. On the other hand, we estimate that the pressure dependence in the local spin picture contradicts with experimental result. Thus, the pressure dependence of superconducting transition temperature is more in line with the itinerant electrons picture. Admittedly, we only made a rough estimation based on the local spin picture. It is expected to conduct further and more detailed research on the pressure dependence of superconducting transition temperature starting from the local spin picture, providing more insights into the underlying superconducting mechanism of La3Ni2O7.
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Keywords:
- RP phase nickelate /
- Superconducting phase diagram /
- Functional renormalization group /
- Itinerant electrons picture /
- Local spin picture
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