Layer Architecture Shapes Electronic, Magnetic, and Lattice Interactions in Ruddlesden-Popper Nickelates

@misc{he2026layer,
  title = {{Layer Architecture Shapes Electronic, Magnetic, and Lattice Interactions in Ruddlesden-Popper Nickelates}},
  author = {W. He and X. Guo and X. Luo and J. Thomas and J. Sears and Sophia F. R. TenHuisen and Ziqiang Guan and Xinglong Chen and D. A. Dahlbom and B. Zager and J. Pelliciari and Yi-Feng Zhao and H. LaBollita and Hong Zheng and M. K. Lajer and J. F. Mitchell and V. Bisogni and A. S. Botana and M. Mitrano and S. Johnston and M. P. M. Dean},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.04532},
  eprint = {2609.04532},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.04532},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Layer Architecture Shapes Electronic, Magnetic, and Lattice Interactions in Ruddlesden-Popper Nickelates
AU  - W. He
AU  - X. Guo
AU  - X. Luo
AU  - J. Thomas
AU  - J. Sears
AU  - Sophia F. R. TenHuisen
AU  - Ziqiang Guan
AU  - Xinglong Chen
AU  - D. A. Dahlbom
AU  - B. Zager
AU  - J. Pelliciari
AU  - Yi-Feng Zhao
AU  - H. LaBollita
AU  - Hong Zheng
AU  - M. K. Lajer
AU  - J. F. Mitchell
AU  - V. Bisogni
AU  - A. S. Botana
AU  - M. Mitrano
AU  - S. Johnston
AU  - M. P. M. Dean
PY  - 2026
DA  - 2026/09/03
PB  - arXiv
DO  - 10.48550/arxiv.2609.04532
UR  - https://arxiv.org/abs/2609.04532
AB  - The discovery of superconductivity in Ruddlesden-Popper nickelates has raised a central question: how does layer architecture shape the electronic, magnetic, and lattice interactions relevant to pairing? Here, we report a detailed comparative study of the two polymorphs of La3Ni2O7--the alternating monolayer-trilayer (LNO-1313) and bilayer (LNO-2222) structures--and the related trilayer compound La4Ni3O10, using both Ni L3- and O K-edge RIXS. We find that LNO-1313 and La4Ni3O10 share strikingly similar electronic, magnetic, and lattice excitations, whereas bilayer LNO-2222 exhibits distinct features. Compared to LNO-2222, LNO-1313 and La4Ni3O10 have weaker orbital polarization, enhanced 3d8L character, a reduced out-of-plane magnetic-exchange scale, and stronger EPC. Within an effective local-moment framework, an entangled-dimer scenario provides a natural description of the spin excitations generated by strong antiferromagnetic interlayer coupling. Its advantage over conventional spin-wave theory is clearest in bilayer LNO-2222, where the interlayer coupling dominates the intralayer interactions. These findings provide critical experimental constraints for future theoretical models for the low-energy physics relevant to superconductivity in these layered nickelates.
ER  -