Li, HaoxiangZhou, XiaoqingNummy, ThomasZhang, JunjiePardo Castro, VíctorPickett, Warren E.Mitchell, J.F.Dessau, D.S.2020-06-012020-06-012017Li, H., Zhou, X., Nummy, T. et al. Fermiology and electron dynamics of trilayer nickelate La4Ni3O10. Nat Commun 8, 704 (2017). https://doi.org/10.1038/s41467-017-00777-0http://hdl.handle.net/10347/22751Layered nickelates have the potential for exotic physics similar to high TC superconducting cuprates as they have similar crystal structures and these transition metals are neighbors in the periodic table. Here we present an angle-resolved photoemission spectroscopy (ARPES) study of the trilayer nickelate La4Ni3O10 revealing its electronic structure and correlations, finding strong resemblances to the cuprates as well as a few key differences. We find a large hole Fermi surface that closely resembles the Fermi surface of optimally hole-doped cuprates, including its dx2−y2 orbital character, hole filling level, and strength of electronic correlations. However, in contrast to cuprates, La4Ni3O10 has no pseudogap in the dx2−y2 band, while it has an extra band of principally d3z2−r2 orbital character, which presents a low temperature energy gap. These aspects drive the nickelate physics, with the differences from the cuprate electronic structure potentially shedding light on the origin of superconductivity in the cuprates.eng© The Author(s) 2017. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/http://creativecommons.org/licenses/by/4.0/.Electronic properties and materialsSuperconducting properties and materialsjournal article10.1038/s41467-017-00777-02041-1723open access