{"paper":{"title":"Are magnetite (Fe3O4) films on MgAl2O4 auxetic?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"M. Ziese","submitted_at":"2011-03-18T17:09:15Z","abstract_excerpt":"Magnetite (Fe3O4) films were fabricated on MgAl2O4 (001) single crystal substrates by pulsed laser deposition. In-plane and out-of-plane lattice constants were determined by X-ray diffraction. The apparent Poisson's ratio was determined as the negative ratio of the out-of-plane to in-plane strains. The results show that (i) the determination of Poisson's ratio by this method is only reliable for fully strained films and (ii) Poisson's ratio = 0.3 along the <100> direction is positive for this archetypal ferrite. Fe3O4 films grown on MgAl2O4 (001) are not auxetic."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1103.3666","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":""},"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"}