Pressure dependence of superconducting transition temperature in bilayer nickelate La3Ni2O7: Itinerant electrons and local spin picture

LU Hongyan; WANG Qianghua

doi:10.7498/aps.74.20250696

Abstract
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.

Keywords:
RP phase nickelate /

Superconducting phase diagram /

Functional renormalization group /

Itinerant electrons picture /

Local spin picture
Cited By

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Pressure dependence of superconducting transition temperature in bilayer nickelate La₃Ni₂O₇: Itinerant electrons and local spin picture

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Pressure dependence of superconducting transition temperature in bilayer nickelate La3Ni2O7: Itinerant electrons and local spin picture

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Pressure dependence of superconducting transition temperature in bilayer nickelate La₃Ni₂O₇: Itinerant electrons and local spin picture