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 shown that in the superconducting region, its superconducting transition temperature decreases monotonically from 83 K at 18 GPa as pressure further increases, exhibiting a nearly right-triangular temperature-pressure phase diagram that is different from the dome-shaped diagrams observed in cuprates and iron-based superconductors under either doping or pressure. It is important to understand this anomalous phase diagram in elucidating the superconducting mechanism of La₃Ni₂O₇. Since the electron-phonon coupling mechanism cannot account for the high superconducting transition temperatures in nickelate superconductors, in this work, the pressure dependence of the transition temperature is investigated from the perspective of the itinerant electrons picture and the local spin picture. By combining the density functional theory (DFT) and the unbiased singular-mode functional renormalization group (SM-FRG) method, it is found that the pairing symmetry is consistently an $s_\pm$-wave, driven by spin fluctuations that become progressively weakened under pressure, thereby decreasing in the superconducting transition temperature, which is in qualitative agreement with the experimental observation. On the other hand, we estimate that the pressure dependence in the local spin picture contradicts with the experimental result. Therefore, the pressure dependence of superconducting transition temperature is more consistent with the itinerant electrons picture. Admittedly, we only made a rough estimation based on the local spin picture. It is expected that further and more detailed research will be conducted on the pressure dependence of superconducting transition temperature from the local spin picture, providing deeper insights into the underlying superconducting mechanism of La₃Ni₂O₇.

Keywords:

Authors and contacts

LU Hongyan¹,
WANG Qianghua²

Corresponding author: LU Hongyan, hylu@qfnu.edu.cn ; WANG Qianghua, qhwang@nju.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 12074213, 12374147, 12274205, 92365203, 11874205, 11574108), the National Key Resaerch and Development Program of China (Grant No. 2022YFA1403201), and the National Natural Science Foundation of Shandong Province, China (Grant No. ZR2021ZD01).

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Pressure	$ \varepsilon_x $	$ \varepsilon_z $	$ t_{(100)}^{x x} $	$ t_{(100)}^{z z} $	$ t_{(100)}^{x z} $	$ t_{\left(00\frac{1}{2}\right)}^{x x} $	$ t_{\left(00\frac{1}{2}\right)}^{z z} $	$ t_{(110)}^{x x} $	$ t_{(110)}^{z z} $	$ t_{\left(10\frac{1}{2}\right)}^{x z} $
14.1	0.728	0.402	–0.470	–0.118	0.235	0.008	–0.623	0.071	–0.018	–0.036
16.1	0.737	0.407	–0.476	–0.119	0.238	0.009	–0.629	0.071	–0.018	–0.037
19.7	0.747	0.411	–0.483	–0.121	0.242	0.009	–0.637	0.071	–0.018	–0.037
21.3	0.749	0.412	–0.486	–0.123	0.243	0.008	–0.640	0.071	–0.018	–0.037
25.7	0.761	0.416	–0.495	–0.125	0.247	0.009	–0.647	0.072	–0.018	–0.037
29.8	0.769	0.417	–0.501	–0.126	0.249	0.010	–0.651	0.072	–0.018	–0.036
40.0	0.803	0.426	–0.521	–0.134	0.259	0.009	–0.674	0.071	–0.015	–0.040
50.0	0.833	0.437	–0.535	–0.139	0.269	0.010	–0.698	0.073	–0.016	–0.042
60.0	0.847	0.435	–0.552	–0.145	0.273	0.011	–0.703	0.075	–0.016	–0.040
70.0	0.871	0.447	–0.566	–0.149	0.283	0.010	–0.723	0.073	–0.017	–0.041
80.0	0.896	0.453	–0.580	–0.153	0.287	0.009	–0.738	0.072	–0.015	–0.045
90.0	0.918	0.461	–0.593	–0.155	0.293	0.008	–0.753	0.071	–0.016	–0.046

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Vol. 74, Issue 17 - 2025-09-05

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