Electronic structure of the alternating monolayer-trilayer phase of La3Ni2O7
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| author | Abadi, Sebastien N. Xu, Ke-Jun Lomeli, Eder G. Puphal, Pascal Isobe, Masahiko Zhong, Yong Fedorov, Alexei V. Mo, Sung-Kwan Hashimoto, Makoto Lu, Dong-Hui Moritz, Brian Keimer, Bernhard Devereaux, Thomas P. Hepting, Matthias Shen, Zhi-Xun |
| author_facet | Abadi, Sebastien N. Xu, Ke-Jun Lomeli, Eder G. Puphal, Pascal Isobe, Masahiko Zhong, Yong Fedorov, Alexei V. Mo, Sung-Kwan Hashimoto, Makoto Lu, Dong-Hui Moritz, Brian Keimer, Bernhard Devereaux, Thomas P. Hepting, Matthias Shen, Zhi-Xun |
| contents | Recent studies of La$_3$Ni$_2$O$_7$ have identified a bilayer (2222) structure and an unexpected alternating monolayer-trilayer (1313) structure, both of which feature signatures of superconductivity near 80 K under high pressures. Using angle-resolved photoemission spectroscopy, we measure the electronic structure of 1313 samples. In contrast to the previously studied 2222 structure, we find that the 1313 structure hosts a flat band with a markedly different binding energy, as well as an additional electron pocket and band splittings. By comparison to local-density approximation calculations, we find renormalizations of the Ni-$d_{z^2}$ and Ni-$d_{x^2-y^2}$ derived bands to be about 5 to 7 and about 4 respectively, suggesting strong correlation effects. These results reveal important differences in the electronic structure brought about by the distinct structural motifs with the same stoichiometry. Such differences may be relevant to the putative high temperature superconductivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_07143 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Electronic structure of the alternating monolayer-trilayer phase of La3Ni2O7 Abadi, Sebastien N. Xu, Ke-Jun Lomeli, Eder G. Puphal, Pascal Isobe, Masahiko Zhong, Yong Fedorov, Alexei V. Mo, Sung-Kwan Hashimoto, Makoto Lu, Dong-Hui Moritz, Brian Keimer, Bernhard Devereaux, Thomas P. Hepting, Matthias Shen, Zhi-Xun Superconductivity Strongly Correlated Electrons Recent studies of La$_3$Ni$_2$O$_7$ have identified a bilayer (2222) structure and an unexpected alternating monolayer-trilayer (1313) structure, both of which feature signatures of superconductivity near 80 K under high pressures. Using angle-resolved photoemission spectroscopy, we measure the electronic structure of 1313 samples. In contrast to the previously studied 2222 structure, we find that the 1313 structure hosts a flat band with a markedly different binding energy, as well as an additional electron pocket and band splittings. By comparison to local-density approximation calculations, we find renormalizations of the Ni-$d_{z^2}$ and Ni-$d_{x^2-y^2}$ derived bands to be about 5 to 7 and about 4 respectively, suggesting strong correlation effects. These results reveal important differences in the electronic structure brought about by the distinct structural motifs with the same stoichiometry. Such differences may be relevant to the putative high temperature superconductivity. |
| title | Electronic structure of the alternating monolayer-trilayer phase of La3Ni2O7 |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2402.07143 |