Impact of Gd Substitution on the Structure, Magnetic Ordering, and Magnetocaloric Response of La0.67Ca0.33MnO3

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dc.contributor.authorSeker, O. F.
dc.contributor.authorIzgi, T.
dc.contributor.authorKolat, V. S.
dc.contributor.authorBayri, N.
dc.contributor.authorGencer, H.
dc.contributor.authorPektas Kolat, M.
dc.contributor.authorAtalay, S.
dc.date.accessioned2026-04-04T13:37:28Z
dc.date.available2026-04-04T13:37:28Z
dc.date.issued2026
dc.departmentİnönü Üniversitesi
dc.description.abstractA comprehensive investigation of the structural, magnetic, and magnetocaloric properties of polycrystalline La0.67-xGdxCa0.33MnO3 (x = 0, 0.05, 0.1, 0.15, and 0.2), synthesized by the solid-state method, has been carried out. X-ray diffraction confirmed that all compositions crystallize in a single-phase orthorhombic Pbnm structure. A systematic decrease in the Curie temperature, from 257 K (x = 0) to 61 K (x = 0.2), was observed and attributed to the suppression of double-exchange interactions and the emergence of magnetic inhomogeneity. Most notably, the substitution of Gd led to a pronounced enhancement in the magnetic entropy change (|Delta SM|), reaching a maximum of 11.24 J/kg K under a 5 T field for the x = 0.2 composition, which stands as one of the highest values reported for manganites. In addition, a secondary anomaly in the entropy change curves, particularly at elevated fields, was associated with a field-induced metamagnetic transition arising from the coexistence of paramagnetic and antiferromagnetic states above TC. Critical behavior analysis based on Arrott plots further revealed that all samples exhibit a first-order magnetic phase transition. These simultaneous observations of exceptionally large Delta SM values and metamagnetic features highlight the potential of these rare-earth-modified manganites for high-performance magnetocaloric applications.
dc.description.sponsorshipInn niversitesi
dc.description.sponsorshipThis work was supported by Inonu University with project number FBG-2025-3877.
dc.identifier.doi10.1007/s10909-026-03378-8
dc.identifier.issn0022-2291
dc.identifier.issn1573-7357
dc.identifier.issue2
dc.identifier.orcid0000-0003-0424-4865
dc.identifier.scopus2-s2.0-105029812769
dc.identifier.scopusqualityQ3
dc.identifier.urihttps://doi.org/10.1007/s10909-026-03378-8
dc.identifier.urihttps://hdl.handle.net/11616/109844
dc.identifier.volume222
dc.identifier.wosWOS:001686972300001
dc.identifier.wosqualityQ4
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherSpringer/Plenum Publishers
dc.relation.ispartofJournal of Low Temperature Physics
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WOS_20250329
dc.subjectMagnetocaloric effect
dc.subjectPerovskite manganite
dc.subjectGd substitution
dc.subjectMagnetic entropy
dc.titleImpact of Gd Substitution on the Structure, Magnetic Ordering, and Magnetocaloric Response of La0.67Ca0.33MnO3
dc.typeArticle

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