{"paper":{"title":"Magnetocaloric Effect in Nanostructured $La_{0.6}Sr_{0.4}Fe_{1-x}Co_{x}O_3$","license":"http://creativecommons.org/licenses/by/4.0/","headline":"Cobalt substitution combined with nanostructuring maximizes magnetocaloric entropy change to 1.13 J/kg K under 3 T in La0.6Sr0.4Fe1-xCoxO3.","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Fabiana N. Morales Alvarez, Joaqu\\'in Sacanell, Mariano Quintero","submitted_at":"2026-05-13T14:43:52Z","abstract_excerpt":"This work presents a systematic study of the magnetocaloric effect in the nanostructured perovskite series $La_{0.6}Sr_{0.4}Fe_{1-x}Co_{x}O_3$ (x = 0, 0.2, 0.5, 0.8, and 1.0), synthesized by a pore-wetting method using polymeric membranes with pore diameters of 200 nm and 800 nm. All samples were calcined at 1000{\\deg}C. Structural characterization was made by X-ray diffraction and confirmed the formation of a single-phase perovskite with distorted rhombohedral symmetry, without detectable secondary phases. We observed significant influence of substitution of Fe by Co on the morphology, as the"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"These results demonstrate that the combination of Co doping and controlled nanostructuring effectively optimizes the magnetocaloric response, with a maximum entropy change of 1.13 J/(kg K) under 3 T for x=1.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That the Maxwell relations applied to the measured magnetization curves give an accurate entropy change without significant contributions from particle-size effects or undetected secondary phases in the nanostructured samples.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Cobalt substitution in these nanostructured perovskites increases ferromagnetic coupling and produces a maximum magnetic entropy change of 1.13 J/kg K under 3 T for the x=1 composition.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Cobalt substitution combined with nanostructuring maximizes magnetocaloric entropy change to 1.13 J/kg K under 3 T in La0.6Sr0.4Fe1-xCoxO3.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"13d5344da690c3d3a25368ea0e1dc6dc0866f45b26059682b7c7894816bf2aea"},"source":{"id":"2605.13611","kind":"arxiv","version":1},"verdict":{"id":"cc1b9e6a-b3d7-4fc8-b6df-93f337ff986f","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-14T18:03:26.031291Z","strongest_claim":"These results demonstrate that the combination of Co doping and controlled nanostructuring effectively optimizes the magnetocaloric response, with a maximum entropy change of 1.13 J/(kg K) under 3 T for x=1.","one_line_summary":"Cobalt substitution in these nanostructured perovskites increases ferromagnetic coupling and produces a maximum magnetic entropy change of 1.13 J/kg K under 3 T for the x=1 composition.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That the Maxwell relations applied to the measured magnetization curves give an accurate entropy change without significant contributions from particle-size effects or undetected secondary phases in the nanostructured samples.","pith_extraction_headline":"Cobalt substitution combined with nanostructuring maximizes magnetocaloric entropy change to 1.13 J/kg K under 3 T in La0.6Sr0.4Fe1-xCoxO3."},"references":{"count":26,"sample":[{"doi":"","year":null,"title":"The MCE is defined as the isothermal change in magnetic entropy (−ΔS) that occurs when a magnetic field is applied to a material","work_id":"b8712f5b-c502-4fa1-b8e5-712b0c93488a","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":null,"title":"Experimental Nanostructured La0.6Sr0.4Fe1-xCoxO3 (x = 0, 0.2, 0.5, 0.8 and 1) samples were prepared by the pore-wetting technique, following the methodology previously reported for La0.6Sr0.4CoO3 pero","work_id":"66e4ae88-dc71-4b2e-9684-4a970e9639d7","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":null,"title":"Results and discussion 40 60 80 30 40 50 60 70 80 90 x = 0 2 1 40 2 42 0 2 1 1 0 1 0 4 d = 800 nm x = 0 d = 200 nm x = 0.2 x = 0.2 Intensity (a.u) x = 0.5 x = 0.5 x = 0.8 x = 0.8 x = 1 2(°) x = 1 Fi","work_id":"5106ac8b-491f-4fb7-ad6f-bd23102e1a82","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":null,"title":"A clear dependence of magnetization on cobalt content is observed","work_id":"e1ea2bde-0c5c-4f7d-b203-6226bf71033e","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2000,"title":"exhibit smaller slopes (on the order of 10-8–10-10 emu g⁻¹ Oe-1), consistent with a more ideal mean-field-like behavior. In contrast, compositions with lower Co content (x = 0.2 – 0.5) show larger slo","work_id":"8ccdb495-1eac-4629-93d0-4a30f67c41fb","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":26,"snapshot_sha256":"8a32cb9caf96fd260e44c760e4f0de2c8a7fad555ff01e4b2e1ac86a0417791e","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"}