Electronic and magnetic excitations in La$_3$Ni$_2$O$_7$
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866909381245796352 |
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| author | Chen, Xiaoyang Choi, Jaewon Jiang, Zhicheng Mei, Jiong Jiang, Kun Li, Jie Agrestini, Stefano Garcia-Fernandez, Mirian Huang, Xing Sun, Hualei Shen, Dawei Wang, Meng Hu, Jiangping Lu, Yi Zhou, Ke-Jin Feng, Donglai |
| author_facet | Chen, Xiaoyang Choi, Jaewon Jiang, Zhicheng Mei, Jiong Jiang, Kun Li, Jie Agrestini, Stefano Garcia-Fernandez, Mirian Huang, Xing Sun, Hualei Shen, Dawei Wang, Meng Hu, Jiangping Lu, Yi Zhou, Ke-Jin Feng, Donglai |
| contents | The striking discovery of high-temperature superconductivity (HTSC) of 80 K in a bilayer nickelate La$_3$Ni$_2$O$_7$ under a moderately high pressure of about 14 GPa ignited a new wave of studying HTSC in nickelates. The properties of the parental phase at ambient pressure may contain key information on basic interactions therein and bosons that may mediate pairing giving birth to superconductivity. Moreover, the bilayer structure of La$_3$Ni$_2$O$_7$ may suggest a distinct minimal model in comparison to cuprate superconductors. Here using X-ray absorption spectroscopy and resonant inelastic X-ray scattering, we studied La$_3$Ni$_2$O$_7$ at ambient pressure, and found that Ni 3$d_{x^2-y^2}$, Ni 3$d_{z^2}$, and ligand oxygen 2$p$ orbitals dominate the low-energy physics with a small charge-transfer energy. Remarkably, well-defined optical-like magnetic excitations were found to soften into a quasi-static spin-density-wave ordering, evidencing the strong electronic correlations and rich magnetic properties. Based on a Heisenberg spin model, we found that the inter-layer effective magnetic superexchange interaction is much larger than the intra-layer ones, and proposed two viable magnetic structures. Our results set the foundation for further exploration of La$_3$Ni$_2$O$_7$ superconductor. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_12657 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Electronic and magnetic excitations in La$_3$Ni$_2$O$_7$ Chen, Xiaoyang Choi, Jaewon Jiang, Zhicheng Mei, Jiong Jiang, Kun Li, Jie Agrestini, Stefano Garcia-Fernandez, Mirian Huang, Xing Sun, Hualei Shen, Dawei Wang, Meng Hu, Jiangping Lu, Yi Zhou, Ke-Jin Feng, Donglai Superconductivity The striking discovery of high-temperature superconductivity (HTSC) of 80 K in a bilayer nickelate La$_3$Ni$_2$O$_7$ under a moderately high pressure of about 14 GPa ignited a new wave of studying HTSC in nickelates. The properties of the parental phase at ambient pressure may contain key information on basic interactions therein and bosons that may mediate pairing giving birth to superconductivity. Moreover, the bilayer structure of La$_3$Ni$_2$O$_7$ may suggest a distinct minimal model in comparison to cuprate superconductors. Here using X-ray absorption spectroscopy and resonant inelastic X-ray scattering, we studied La$_3$Ni$_2$O$_7$ at ambient pressure, and found that Ni 3$d_{x^2-y^2}$, Ni 3$d_{z^2}$, and ligand oxygen 2$p$ orbitals dominate the low-energy physics with a small charge-transfer energy. Remarkably, well-defined optical-like magnetic excitations were found to soften into a quasi-static spin-density-wave ordering, evidencing the strong electronic correlations and rich magnetic properties. Based on a Heisenberg spin model, we found that the inter-layer effective magnetic superexchange interaction is much larger than the intra-layer ones, and proposed two viable magnetic structures. Our results set the foundation for further exploration of La$_3$Ni$_2$O$_7$ superconductor. |
| title | Electronic and magnetic excitations in La$_3$Ni$_2$O$_7$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2401.12657 |