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dc.contributor.authorGomes, M. M.
dc.contributor.authorCarvalho, T. T.
dc.contributor.authorManjunath, B.
dc.contributor.authorVilarinho, R.
dc.contributor.authorGibbs, A. S.
dc.contributor.authorKnight, K. S.
dc.contributor.authorPaixão, J. A.
dc.contributor.authorAmaral, V. S.
dc.contributor.authorAlmeida, A.
dc.contributor.authorTavares, P. B.
dc.contributor.authorMoreira, J. Agostinho
dc.identifier.citationGomes , M M , Carvalho , T T , Manjunath , B , Vilarinho , R , Gibbs , A S , Knight , K S , Paixão , J A , Amaral , V S , Almeida , A , Tavares , P B & Moreira , J A 2021 , ' Disentangling the phase sequence and correlated critical properties in Bi 0.7 La 0.3 FeO 3 by structural studies ' , Physical Review B , vol. 104 , no. 17 , 174109 .
dc.identifier.otherPURE: 279393018
dc.identifier.otherPURE UUID: f4f10f7d-bc9c-407d-95d4-8ee31cb08c73
dc.identifier.otherScopus: 85120384013
dc.identifier.otherORCID: /0000-0002-7012-1831/work/112711397
dc.descriptionFunding: The authors would like to acknowledge Fundação para a Ciência e Tecnologia (FCT) through projects NORTE/01/0145/FEDER/028538, CERN/FIS-PAR/0005/2017, CERN/FIS-TEC/0003/2019, PTDC/FIS-MAC/29454/2017, and when appropriate cofinanced by ERDF under PT2020 Partnership Agreement: CQVR, projects UID/QUI/00616/2013 and UIDB/QUI/00616/2020; IFIMUP: Norte-070124-FEDER-000070; NECL: NORTE-01-0145-FEDER-022096, UID/NAN/50024/2019, CFisUC: UIDB/04564/2020 and UIDP/04564/2020; CICECO-Aveiro Institute of Materials: UIDB/50011/2020 and UIDP/50011/2020. M.M.G. and B.M. acknowledge the grants from the project PTDC/NAN-MAT/28538/2017.en
dc.description.abstractThis work addresses the study of the high-temperature phase sequence of Bi0.7La0.3FeO3 by undertaking temperature-dependent high-resolution neutron powder diffraction (NPD) and Raman spectroscopy measurements. A determination of lattice parameters, phase fractions, and modulation wave vector was performed by Pawley refinement of the NPD data. The analysis revealed that Bi0.7La0.3FeO3 exhibits an incommensurate modulated orthorhombic Pn21a(00γ)000 structure at room temperature, with a weak ferromagnetic behavior, likely arising from a canted antiferromagnetic ordering. Above T1=543K, the low-temperature modulated Pn21a(00γ)000 evolves monotonically into a fractionally growing Pnma structure up to TN=663K. At 663 K, the low-temperature canted antiferromagnetic phase is suppressed concurrently with the switching of the former into a nonmodulated Pn21a structure that continues to coexist with the Pnma one, until the latter is expected to reach the 100% fraction of the sample volume at high temperatures above 733 K. The Pn21a space group is obtained from the Pnma one through the Γ4- polar distortion. Neutron diffraction and Raman spectroscopy results provide evidence for the emergence of noteworthy linear spin-phonon coupling. In this regard, magnetostructural coupling is observed below TN, revealed by the relation between the weak ferromagnetism of the canted iron spins and the FeO6 octahedra symmetric stretching mode. The correlation between magnetization and structural results from NPD provides definite evidence for the magnetic origin of the structural modulation. The analysis of the temperature-dependent magnetization and the magnetic peak intensity as well yields a critical exponent (β) value of 0.38. The lower limit of the phase coexistence temperature T1=543K, marking the emergence of the Pnma phase, is also associated with the temperature whereupon the modulation magnitude starts to decrease.
dc.relation.ispartofPhysical Review Ben
dc.rightsCopyright © 2021 American Physical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at
dc.subjectQC Physicsen
dc.subjectElectronic, Optical and Magnetic Materialsen
dc.subjectCondensed Matter Physicsen
dc.titleDisentangling the phase sequence and correlated critical properties in Bi0.7La0.3FeO3 by structural studiesen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Chemistryen
dc.contributor.institutionUniversity of St Andrews. Centre for Designer Quantum Materialsen
dc.description.statusPeer revieweden

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