Ni-O hybridization as a stabilizer for s± superconductivity in La3Ni2O7: a DFT+RPA study
Abstract
The superconducting gap symmetry of high-pressure bilayer nickelates remains under debate, with weak- and strong-coupling approaches yielding different pairing tendencies. In this work, we investigate how the weak-coupling treatment of electronic states away from the Fermi level influences magnetic fluctuations and superconductivity in La3Ni2O7. We employ a full-spectrum model based on orthonormalized projections of Kohn-Sham states onto local Ni-eg orbitals, which preserves the density-functional band structure while redistributing spectral weight over a wide energy range. Compared to a low-energy description, this approach yields enhanced interlayer spin fluctuations and a commensurate magnetic instability. Within a spin-fluctuation framework, these features favor a sign-changing s± superconducting state, whereas low-energy models tend to stabilize d-wave pairing. Our results suggest that interlayer coupling in full-energy models may play an important role in shaping the predicted pairing symmetry of bilayer nickelates.
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BibTeX
@misc{braz2026hybridization,
title = {{Ni-O hybridization as a stabilizer for $s^\pm$ superconductivity in La$_3$Ni$_2$O$_7$: a DFT+RPA study}},
author = {Lauro B. Braz and Daniel D. Rivera and Emmanuel V. C. Lopes and George B. Martins and Gustavo M. Dalpian and Luis G. G. V. Dias da Silva},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.05185},
eprint = {2609.05185},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.05185},
}
RIS
TY - UNPB
TI - Ni-O hybridization as a stabilizer for s^± superconductivity in La_3Ni_2O_7: a DFT+RPA study
AU - Lauro B. Braz
AU - Daniel D. Rivera
AU - Emmanuel V. C. Lopes
AU - George B. Martins
AU - Gustavo M. Dalpian
AU - Luis G. G. V. Dias da Silva
PY - 2026
DA - 2026/09/04
PB - arXiv
DO - 10.48550/arxiv.2609.05185
UR - https://arxiv.org/abs/2609.05185
AB - The superconducting gap symmetry of high-pressure bilayer nickelates remains under debate, with weak- and strong-coupling approaches yielding different pairing tendencies. In this work, we investigate how the weak-coupling treatment of electronic states away from the Fermi level influences magnetic fluctuations and superconductivity in La_3Ni_2O_7. We employ a full-spectrum model based on orthonormalized projections of Kohn-Sham states onto local Ni-e_g orbitals, which preserves the density-functional band structure while redistributing spectral weight over a wide energy range. Compared to a low-energy description, this approach yields enhanced interlayer spin fluctuations and a commensurate magnetic instability. Within a spin-fluctuation framework, these features favor a sign-changing s^± superconducting state, whereas low-energy models tend to stabilize d-wave pairing. Our results suggest that interlayer coupling in full-energy models may play an important role in shaping the predicted pairing symmetry of bilayer nickelates.
ER -