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| Format: | Preprint |
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2026
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| Online Access: | https://arxiv.org/abs/2604.26627 |
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| _version_ | 1866909000771043328 |
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| author | Leonov, I. V. |
| author_facet | Leonov, I. V. |
| contents | Using DFT+DMFT we study the normal-state electronic structure and magnetic correlations of the recently discovered alternating single-layer bilayer Raddlesden-Popper nickelate La$_5$Ni$_3$O$_{11}$ (1212-LNO). Our results exhibit qualitative differences for the structurally distinct single-layer and bilayer Ni ions, implying the importance of confinement and orbital-dependent correlations. The Ni $e_g$ electronic states originating from the bilayer Ni ions form strongly renormalized quasiparticle bands with a large enhancement factor $m^*/m \sim 3.5$ and 4.2 for the Ni $x^2-y^2$ and $3z^2-r^2$ orbitals, respectively. Moreover, the $e_g$ states of the single-layer Ni ions exhibit an orbital-selective Mott insulating state, with a narrow energy gap for the Ni $3z^2-r^2$ states and metallic, strongly incoherent (non-Fermi-liquid) Ni $x^2-y^2$ ones. Our analysis of magnetic correlations suggests the formation of intertwined spin and charge density wave stripes in the bilayer NiO$_6$ slab, in close similarity to the double-layer material. We refine two major instabilities, a leading one is associated with a wave vector ${\bf Q}=(\frac{1}{3},\frac{1}{3})$ (``up-down-0" spin pattern), competing with the bicollinear $(\frac{1}{4},\frac{1}{4})$ (``up-up-down-down") stripe state. The single-layer Ni $3d$ electrons exhibit instability towards the Néel-type magnetic state. Under pressure, 1212-LNO undergoes an orbital-selective Mott insulator-to-metal phase transition, associated with metallization of the single-layer Ni $e_g$ states. As a result, the single-layer Ni $e_g$ bands exhibit non-Fermi-liquid (bad metal) behavior with strongly incoherent spectral weights near $E_F$. We note that correlation effects result in a reconstruction of magnetic correlations as compared to that obtained within DFT. In fact, we observe a crossover from single-layer to double-layer dominated magnetic correlations. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_26627 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Electronic structure, quasiparticle renormalizations, and magnetic correlations in the alternating single-layer bilayer nickelate La$_5$Ni$_3$O$_{11}$ Leonov, I. V. Strongly Correlated Electrons Superconductivity Using DFT+DMFT we study the normal-state electronic structure and magnetic correlations of the recently discovered alternating single-layer bilayer Raddlesden-Popper nickelate La$_5$Ni$_3$O$_{11}$ (1212-LNO). Our results exhibit qualitative differences for the structurally distinct single-layer and bilayer Ni ions, implying the importance of confinement and orbital-dependent correlations. The Ni $e_g$ electronic states originating from the bilayer Ni ions form strongly renormalized quasiparticle bands with a large enhancement factor $m^*/m \sim 3.5$ and 4.2 for the Ni $x^2-y^2$ and $3z^2-r^2$ orbitals, respectively. Moreover, the $e_g$ states of the single-layer Ni ions exhibit an orbital-selective Mott insulating state, with a narrow energy gap for the Ni $3z^2-r^2$ states and metallic, strongly incoherent (non-Fermi-liquid) Ni $x^2-y^2$ ones. Our analysis of magnetic correlations suggests the formation of intertwined spin and charge density wave stripes in the bilayer NiO$_6$ slab, in close similarity to the double-layer material. We refine two major instabilities, a leading one is associated with a wave vector ${\bf Q}=(\frac{1}{3},\frac{1}{3})$ (``up-down-0" spin pattern), competing with the bicollinear $(\frac{1}{4},\frac{1}{4})$ (``up-up-down-down") stripe state. The single-layer Ni $3d$ electrons exhibit instability towards the Néel-type magnetic state. Under pressure, 1212-LNO undergoes an orbital-selective Mott insulator-to-metal phase transition, associated with metallization of the single-layer Ni $e_g$ states. As a result, the single-layer Ni $e_g$ bands exhibit non-Fermi-liquid (bad metal) behavior with strongly incoherent spectral weights near $E_F$. We note that correlation effects result in a reconstruction of magnetic correlations as compared to that obtained within DFT. In fact, we observe a crossover from single-layer to double-layer dominated magnetic correlations. |
| title | Electronic structure, quasiparticle renormalizations, and magnetic correlations in the alternating single-layer bilayer nickelate La$_5$Ni$_3$O$_{11}$ |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2604.26627 |