Critical phenomena and estimation of the spontaneous magnetization through magnetic entropy change in La0.67Ba0.33Mn0.98Ti0.02O3
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| Title: | Critical phenomena and estimation of the spontaneous magnetization through magnetic entropy change in La |
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| Authors: | Oumezzine, Marwène1 oumezzine@hotmail.co.uk, Peña, Octavio2, Kallel, Sami1, Zemni, Sadok1 |
| Source: | Solid State Sciences. Oct2011, Vol. 13 Issue 10, p1829-1834. 6p. |
| Subjects: | Lanthanum compounds, Estimation theory, Magnetization, Entropy, Perovskite, Critical phenomena (Physics), Manganite |
| Abstract: | Abstract: The critical properties of the manganese perovskite La0.67Ba0.33Mn0.98Ti0.02O3 around the paramagnetic-ferromagnetic phase transition were investigated through various techniques such as modified Arrott plot, Kouvel–Fisher method and critical isotherm analysis based on the data of static magnetic measurements recorded around the Curie temperature T c. The magnetic data analyzed in the critical region using the above methods yield the critical exponents β =0.551±0.008 with T c =310.47K±0.10 (from the temperature dependence of the spontaneous magnetization below T C) and γ =1.020±0.024 with T C =310.11K±0.14 (from the temperature dependence of the inverse initial susceptibility above T C) and δ =2.826, determined separately from the isothermal magnetization at T C. These critical exponents fulfill the Widom scaling relation δ =1+ γ/β, implying that the obtained values of β and γ are reliable. Based on these critical exponents, the magnetization–field–temperature (M–H–T) data around T c collapse into two curves obeying the single scaling equation . The values deduced for the critical exponents in La0.67Ba0.33Mn0.98Ti0.02O3 are close to the theoretical prediction of the mean-field model rather than the universal theory of 3D-Heisenberg, 3D-Ising and tricritical mean-field models. Moreover we have investigated the validity and usefulness of the theoretical modeling in our compound La0.67Ba0.33Mn0.98Ti0.02O3 based on the mean-field analysis of the magnetic entropy change (‑∆S M) versus the magnetization data. Results obtained through this approach are compared to those obtained from extrapolation of the Arrott curves. An excellent agreement was obtained between this approach with the one obtained from the extrapolation of the Arrott curves. [Copyright &y& Elsevier] |
| Copyright of Solid State Sciences is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 65950759 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Critical phenomena and estimation of the spontaneous magnetization through magnetic entropy change in La<subscript>0.67</subscript>Ba<subscript>0.33</subscript>Mn<subscript>0.98</subscript>Ti<subscript>0.02</subscript>O<subscript>3</subscript> – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Oumezzine%2C+Marwène%22">Oumezzine, Marwène</searchLink><relatesTo>1</relatesTo><i> oumezzine@hotmail.co.uk</i><br /><searchLink fieldCode="AR" term="%22Peña%2C+Octavio%22">Peña, Octavio</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Kallel%2C+Sami%22">Kallel, Sami</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zemni%2C+Sadok%22">Zemni, Sadok</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Solid+State+Sciences%22">Solid State Sciences</searchLink>. Oct2011, Vol. 13 Issue 10, p1829-1834. 6p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Lanthanum+compounds%22">Lanthanum compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Estimation+theory%22">Estimation theory</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetization%22">Magnetization</searchLink><br /><searchLink fieldCode="DE" term="%22Entropy%22">Entropy</searchLink><br /><searchLink fieldCode="DE" term="%22Perovskite%22">Perovskite</searchLink><br /><searchLink fieldCode="DE" term="%22Critical+phenomena+%28Physics%29%22">Critical phenomena (Physics)</searchLink><br /><searchLink fieldCode="DE" term="%22Manganite%22">Manganite</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract: The critical properties of the manganese perovskite La0.67Ba0.33Mn0.98Ti0.02O3 around the paramagnetic-ferromagnetic phase transition were investigated through various techniques such as modified Arrott plot, Kouvel–Fisher method and critical isotherm analysis based on the data of static magnetic measurements recorded around the Curie temperature T c. The magnetic data analyzed in the critical region using the above methods yield the critical exponents β =0.551±0.008 with T c =310.47K±0.10 (from the temperature dependence of the spontaneous magnetization below T C) and γ =1.020±0.024 with T C =310.11K±0.14 (from the temperature dependence of the inverse initial susceptibility above T C) and δ =2.826, determined separately from the isothermal magnetization at T C. These critical exponents fulfill the Widom scaling relation δ =1+ γ/β, implying that the obtained values of β and γ are reliable. Based on these critical exponents, the magnetization–field–temperature (M–H–T) data around T c collapse into two curves obeying the single scaling equation . The values deduced for the critical exponents in La0.67Ba0.33Mn0.98Ti0.02O3 are close to the theoretical prediction of the mean-field model rather than the universal theory of 3D-Heisenberg, 3D-Ising and tricritical mean-field models. Moreover we have investigated the validity and usefulness of the theoretical modeling in our compound La0.67Ba0.33Mn0.98Ti0.02O3 based on the mean-field analysis of the magnetic entropy change (‑∆S M) versus the magnetization data. Results obtained through this approach are compared to those obtained from extrapolation of the Arrott curves. An excellent agreement was obtained between this approach with the one obtained from the extrapolation of the Arrott curves. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Solid State Sciences is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.solidstatesciences.2011.07.019 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 6 StartPage: 1829 Subjects: – SubjectFull: Lanthanum compounds Type: general – SubjectFull: Estimation theory Type: general – SubjectFull: Magnetization Type: general – SubjectFull: Entropy Type: general – SubjectFull: Perovskite Type: general – SubjectFull: Critical phenomena (Physics) Type: general – SubjectFull: Manganite Type: general Titles: – TitleFull: Critical phenomena and estimation of the spontaneous magnetization through magnetic entropy change in La0.67Ba0.33Mn0.98Ti0.02O3 Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Oumezzine, Marwène – PersonEntity: Name: NameFull: Peña, Octavio – PersonEntity: Name: NameFull: Kallel, Sami – PersonEntity: Name: NameFull: Zemni, Sadok IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2011 Type: published Y: 2011 Identifiers: – Type: issn-print Value: 12932558 Numbering: – Type: volume Value: 13 – Type: issue Value: 10 Titles: – TitleFull: Solid State Sciences Type: main |
| ResultId | 1 |
