Reentrant spin glass behavior in polycrystalline La0.7Sr0.3Mn1-X FeX O 3

dc.contributor.authorAraújo, José Humberto de
dc.contributor.authorXavier Jr., M. M.
dc.contributor.authorCabral, F. A. O.
dc.contributor.authorDumelow, T.
dc.contributor.authorCoelho, A. A.
dc.date.accessioned2020-05-15T13:02:22Z
dc.date.available2020-05-15T13:02:22Z
dc.date.issued2004
dc.description.abstractThe magnetic and transport properties of the compound La0.7Sr0.3Mn1-xFexO3(0.1 ≤ x ≤ 0.4) have been studied by means of electrical resistivity, AC magnetic susceptibility, and DC magneti- zation. At low concentrations (x ≤ 0.1), the system displays essentially para-to-ferromagnetic transitions as the temperature is decreased, although a decrease in the magnetic moment has been observed in previous studies at temperatures a little below TC. This ferromagnetism is explained by double exchange theory in terms of the formation of Mn+3/Mn+4 ions pairs in the system. At concentrations in the range 0.1 < x ≤ 0.4 the system is more complex. Increased Fe doping not only weakens the ferromagnetic (FM) order and augments the resistivity of the samples, but also induces the appearance of a reentrant spin glass phase at low temperatures (T < 60 K). Irreversibil- ity of the magnetization measured with zero field cooling and with field cooling has been ob- served. In addition, the AC susceptibility peak position varies with frequency. All these effects are characteristic of spin glass behavior. The results have been interpreted based in an increase of frustration due to increasing competition between FM Mn+3/Mn+4 interactions and antiferromagnetic interactions between ions at the boundaries of Fe clusters.pt_BR
dc.description.resumoThe magnetic and transport properties of the compound La0.7Sr0.3Mn1-xFexO3(0.1 ≤ x ≤ 0.4) have been studied by means of electrical resistivity, AC magnetic susceptibility, and DC magneti- zation. At low concentrations (x ≤ 0.1), the system displays essentially para-to-ferromagnetic transitions as the temperature is decreased, although a decrease in the magnetic moment has been observed in previous studies at temperatures a little below TC. This ferromagnetism is explained by double exchange theory in terms of the formation of Mn+3/Mn+4 ions pairs in the system. At concentrations in the range 0.1 < x ≤ 0.4 the system is more complex. Increased Fe doping not only weakens the ferromagnetic (FM) order and augments the resistivity of the samples, but also induces the appearance of a reentrant spin glass phase at low temperatures (T < 60 K). Irreversibil- ity of the magnetization measured with zero field cooling and with field cooling has been ob- served. In addition, the AC susceptibility peak position varies with frequency. All these effects are characteristic of spin glass behavior. The results have been interpreted based in an increase of frustration due to increasing competition between FM Mn+3/Mn+4 interactions and antiferromagnetic interactions between ions at the boundaries of Fe clusters.pt_BR
dc.identifier.citationARAUJO, José Humberto de et al. Reentrant spin glass behavior in polycrystalline La0.7Sr0.3Mn1-XFeXO 3. Materials Research, São Carlos, v. 7, n. 2, p. 355-357, 2004. ISSN 1980-5373. DOI https://doi.org/10.1590/S1516-14392004000200023. Disponivel em: https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392004000200023&lng=en&tlng=en. Acesso em: 15 maio 2020.pt_BR
dc.identifier.doi10.1590/S1516-14392004000200023
dc.identifier.issn1516-1439 (online), 1980-5373 (print)
dc.identifier.urihttps://repositorio.ufrn.br/jspui/handle/123456789/28982
dc.languageenpt_BR
dc.publisherMaterials Researchpt_BR
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Brazil*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/br/*
dc.subjectspin glasspt_BR
dc.subjectmanganitept_BR
dc.subjectrare earthspt_BR
dc.titleReentrant spin glass behavior in polycrystalline La0.7Sr0.3Mn1-X FeX O 3pt_BR
dc.typearticlept_BR

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