{"paper":{"title":"Dichotomous electronic system in a bilayer Ni$^{1+}$ nickelate","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"cond-mat.supr-con","authors_text":"K.-W. Lee, W. E. Pickett, Young-Joon Song","submitted_at":"2026-06-09T08:28:18Z","abstract_excerpt":"``Infinite layer'' nickelates (ILNs) ${\\cal R}$NiO$_2$ (${\\cal R}$=rare earth elements), having empty apical O sites, become superconducting upon hole doping. They display a secondary electron Fermi surface (FS), giving hole doping, arising not from atomic orbitals but from a band based on interstitial density. Newly reported La$_3$Ni$_2$O$_5$F, formally Ni$^{1+}$, provides an unexpected example of ILN with essentially ideal two dimensional character. A partially occupied single band $E^*$, based on interstitial density, has distinct properties, as its strongly anisotropic shape extends over t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.10564","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2606.10564/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}