{"paper":{"title":"Tracing the horizon of tetragonal-to-monoclinic distortion in pressurized trilayer nickelate La4Ni3O10","license":"http://creativecommons.org/licenses/by/4.0/","headline":"Pressurized La4Ni3O10 undergoes a direct tetragonal-to-monoclinic transition with no intermediate orthorhombic phase.","cross_cats":[],"primary_cat":"cond-mat.str-el","authors_text":"Abdellali Hadj-Azzem, Alain Pautrat, Alexei Bosak, Carsten Paulmann, Diego Valenti, Dmitry Chernyshov, Elise Pachoud, Gaston Garbarino, Johnathan Bulled, Leila Noohinejad, Marie-Aude Measson, Matteo D'astuto, Matthieu Quenot, Olivier Perez, Pierre Rodiere, Pierre Toulemonde, Sander van Smaalen, Sebastien Pairis, Sitaram Ramakrishnan, Valerio Olevano, Yingzheng Gao","submitted_at":"2025-12-04T16:47:11Z","abstract_excerpt":"The crux of understanding the superconducting mechanism in pressurized Ruddlesden-Popper nickelates hinges on elucidating their structural phases. Under ambient conditions, the trilayer nickelate La4Ni3O10 stabilizes in a twinned monoclinic structure with space group P21/c. Upon heating, it undergoes a structural transition to the tetragonal I4/mmm phase at Ts ~ 1030 K, while a second transition associated with the onset of density-weave (DW) ordering emerges upon cooling below TDW ~ 135 K. Here from pressure-temperature x-ray diffraction on high quality flux-grown single crystals we demonstra"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"we unequivocally demonstrate a direct tetragonal-to-monoclinic transition with no trace of intermediate orthorhombic Bmab phase","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The assumption that the observed superlattice reflections and Raman mode changes are intrinsic to the bulk crystal rather than surface or defect effects in the flux-grown samples.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Pressure drives a direct tetragonal-to-monoclinic transition in La4Ni3O10 that can be suppressed to 20 K at 14 GPa, with new observations of density-wave satellites in flux-grown crystals.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Pressurized La4Ni3O10 undergoes a direct tetragonal-to-monoclinic transition with no intermediate orthorhombic phase.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"b1124eb8823c36f13c1d5d08519626dbea072f71bd1cd785098cb7d6fd7e891a"},"source":{"id":"2512.04975","kind":"arxiv","version":3},"verdict":{"id":"21c8a631-8a38-4aa2-9a16-2e146b7d571d","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-17T01:01:13.890868Z","strongest_claim":"we unequivocally demonstrate a direct tetragonal-to-monoclinic transition with no trace of intermediate orthorhombic Bmab phase","one_line_summary":"Pressure drives a direct tetragonal-to-monoclinic transition in La4Ni3O10 that can be suppressed to 20 K at 14 GPa, with new observations of density-wave satellites in flux-grown crystals.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The assumption that the observed superlattice reflections and Raman mode changes are intrinsic to the bulk crystal rather than surface or defect effects in the flux-grown samples.","pith_extraction_headline":"Pressurized La4Ni3O10 undergoes a direct tetragonal-to-monoclinic transition with no intermediate orthorhombic phase."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2512.04975/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"}