Electronic structure of the alternating monolayer-trilayer phase of La3Ni2O7
Abstract
Recent studies of LaNiO 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- and Ni- 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.
Keywords
Cite
@article{arxiv.2402.07143,
title = {Electronic structure of the alternating monolayer-trilayer phase of La3Ni2O7},
author = {Sebastien N. Abadi and Ke-Jun Xu and Eder G. Lomeli and Pascal Puphal and Masahiko Isobe and Yong Zhong and Alexei V. Fedorov and Sung-Kwan Mo and Makoto Hashimoto and Dong-Hui Lu and Brian Moritz and Bernhard Keimer and Thomas P. Devereaux and Matthias Hepting and Zhi-Xun Shen},
journal= {arXiv preprint arXiv:2402.07143},
year = {2024}
}
Comments
Version 2: Improved data quality of the small electron pocket at the zone center ($\epsilon$ band). Also, observations of multilayer splitting effects in the flat band ($\gamma$ and $\delta$ bands) and in the large cuprate-like pockets ($\beta$ bands). Band structure calculations now use LDA instead of LDA+U. Main text: 7 pages, 3 figures. SM: 9 pages, 6 figures