Nature of magnetism in bilayer nickelate La3Ni2O7 single crystals
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arXiv
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| Autores principales: | , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| Materias: | |
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| _version_ | 1866914528859521024 |
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| author | Chen, Lixing Zhang, Enkang Hao, Yiqing Zhu, Yinghao Cui, Bingkun Abernathy, Douglas L. Williams, Travis J. Ikeda, Yoichi Zhang, Hao Liu, Feiyang Wang, Wenbin Wang, Qisi Zhao, Jun |
| author_facet | Chen, Lixing Zhang, Enkang Hao, Yiqing Zhu, Yinghao Cui, Bingkun Abernathy, Douglas L. Williams, Travis J. Ikeda, Yoichi Zhang, Hao Liu, Feiyang Wang, Wenbin Wang, Qisi Zhao, Jun |
| contents | The recent discovery of high-temperature superconductivity in pressurized and thin film nickelates has generated intense interest, yet the nature of magnetism in their ambient-pressure parent phases remains poorly understood, despite its potentially crucial role in pairing. Here we use neutron scattering to resolve the spin order and dynamics of single-crystalline La3Ni2O7, an ambient-pressure parent of this class. Well defined spin excitations are observed at Q = (0, 0.5, 2.5), featuring a~5 meV spin gap and anisotropic in-plane dispersions, with zone-boundary softening along the transverse direction indicative of competing exchange interactions. The excitations exhibit pronounced out-of-plane modulations with bilayer periodicity, providing direct evidence for antiferromagnetic interlayer coupling. Their dispersion is well described by a bilayer Heisenberg Hamiltonian with strong interlayer exchange and competing in-plane couplings within a stripe-type magnetic order. Normalization of the spectra to absolute units reveals that, although the spin-wave bandwidth is only about 25% of that in cuprates, the local dynamic susceptibility at comparable energies is significantly enhanced, yielding a total fluctuating moment of comparable magnitude. These results highlight intense mid-energy spin excitations rooted in substantial electronic correlations as a defining feature of this family, establishing a magnetic framework distinct from cuprates and directly relevant to understanding superconductivity in this system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_03448 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Nature of magnetism in bilayer nickelate La3Ni2O7 single crystals Chen, Lixing Zhang, Enkang Hao, Yiqing Zhu, Yinghao Cui, Bingkun Abernathy, Douglas L. Williams, Travis J. Ikeda, Yoichi Zhang, Hao Liu, Feiyang Wang, Wenbin Wang, Qisi Zhao, Jun Strongly Correlated Electrons Materials Science Superconductivity The recent discovery of high-temperature superconductivity in pressurized and thin film nickelates has generated intense interest, yet the nature of magnetism in their ambient-pressure parent phases remains poorly understood, despite its potentially crucial role in pairing. Here we use neutron scattering to resolve the spin order and dynamics of single-crystalline La3Ni2O7, an ambient-pressure parent of this class. Well defined spin excitations are observed at Q = (0, 0.5, 2.5), featuring a~5 meV spin gap and anisotropic in-plane dispersions, with zone-boundary softening along the transverse direction indicative of competing exchange interactions. The excitations exhibit pronounced out-of-plane modulations with bilayer periodicity, providing direct evidence for antiferromagnetic interlayer coupling. Their dispersion is well described by a bilayer Heisenberg Hamiltonian with strong interlayer exchange and competing in-plane couplings within a stripe-type magnetic order. Normalization of the spectra to absolute units reveals that, although the spin-wave bandwidth is only about 25% of that in cuprates, the local dynamic susceptibility at comparable energies is significantly enhanced, yielding a total fluctuating moment of comparable magnitude. These results highlight intense mid-energy spin excitations rooted in substantial electronic correlations as a defining feature of this family, establishing a magnetic framework distinct from cuprates and directly relevant to understanding superconductivity in this system. |
| title | Nature of magnetism in bilayer nickelate La3Ni2O7 single crystals |
| topic | Strongly Correlated Electrons Materials Science Superconductivity |
| url | https://arxiv.org/abs/2605.03448 |