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Theoretical analysis of magnetic properties and the magnetocaloric effect using the Blume-Capel model.

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Title: Theoretical analysis of magnetic properties and the magnetocaloric effect using the Blume-Capel model.
Authors: Oliveira, S.1,2, Morais, R. H. M.1, Santos, J. P.1,3, Sá Barreto, F. C.4
Source: Condensed Matter Physics. 2022, Vol. 25 Issue 1, p1-11. 11p.
Subjects: Magnetic properties, Magnetic transitions, First-order phase transitions, Magnetic entropy, Clausius-Clapeyron relation, Magnetocaloric effects
Abstract: This work investigates the magnetic properties and the magnetocaloric effect in the spin-1 Blume-Capel model. The study was carried out using the mean-field theory from the Bogoliubov inequality to obtain the expressions of free energy, magnetization and entropy. The magnetocaloric effect was calculated from the variation of the entropy obtained by the mean-field theory. Due to the dependence on the external magnetic field and the anisotropy included in the model, the results for the magnetocaloric effect provided the system with first-order and continuous phase transitions. To ensure the results, the Maxwell relations were used in the intervals where the model presents continuous variations in magnetization and the Clausius-Clapeyron equation in the intervals where the model presents discontinuity in the magnetization. The methods and models for the analysis of a magnetic entropy change and first-order and continuous magnetic phase transitions, such as mean-field theory and the Blume-Capel model, are useful tools in understanding the nature of the magnetocaloric effect and its physical relevance. [ABSTRACT FROM AUTHOR]
Copyright of Condensed Matter Physics is the property of National Academy of Sciences of Ukraine, the Institute for Condensed Matter Physics 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.)
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  Data: Theoretical analysis of magnetic properties and the magnetocaloric effect using the Blume-Capel model.
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  Data: <searchLink fieldCode="JN" term="%22Condensed+Matter+Physics%22">Condensed Matter Physics</searchLink>. 2022, Vol. 25 Issue 1, p1-11. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Magnetic+properties%22">Magnetic properties</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+transitions%22">Magnetic transitions</searchLink><br /><searchLink fieldCode="DE" term="%22First-order+phase+transitions%22">First-order phase transitions</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+entropy%22">Magnetic entropy</searchLink><br /><searchLink fieldCode="DE" term="%22Clausius-Clapeyron+relation%22">Clausius-Clapeyron relation</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetocaloric+effects%22">Magnetocaloric effects</searchLink>
– Name: Abstract
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  Data: This work investigates the magnetic properties and the magnetocaloric effect in the spin-1 Blume-Capel model. The study was carried out using the mean-field theory from the Bogoliubov inequality to obtain the expressions of free energy, magnetization and entropy. The magnetocaloric effect was calculated from the variation of the entropy obtained by the mean-field theory. Due to the dependence on the external magnetic field and the anisotropy included in the model, the results for the magnetocaloric effect provided the system with first-order and continuous phase transitions. To ensure the results, the Maxwell relations were used in the intervals where the model presents continuous variations in magnetization and the Clausius-Clapeyron equation in the intervals where the model presents discontinuity in the magnetization. The methods and models for the analysis of a magnetic entropy change and first-order and continuous magnetic phase transitions, such as mean-field theory and the Blume-Capel model, are useful tools in understanding the nature of the magnetocaloric effect and its physical relevance. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Condensed Matter Physics is the property of National Academy of Sciences of Ukraine, the Institute for Condensed Matter Physics 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:
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        Value: 10.5488/CMP.25.13702
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      – Code: eng
        Text: English
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        PageCount: 11
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      – SubjectFull: Magnetic properties
        Type: general
      – SubjectFull: Magnetic transitions
        Type: general
      – SubjectFull: First-order phase transitions
        Type: general
      – SubjectFull: Magnetic entropy
        Type: general
      – SubjectFull: Clausius-Clapeyron relation
        Type: general
      – SubjectFull: Magnetocaloric effects
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      – TitleFull: Theoretical analysis of magnetic properties and the magnetocaloric effect using the Blume-Capel model.
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              Text: 2022
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