Journal of Superconductivity and Novel Magnetism

, Volume 30, Issue 1, pp 187–195 | Cite as

Critical Behavior Near the Paramagnetic to Ferromagnetic Phase Transition in (La 0 . 6 Ca 0 . 4 MnO3)/x(CuO) Ceramic Composites

  • M. Nasri
  • J. Khelifi
  • M. Triki
  • E. Dhahri
  • E. K. Hlil
Original Paper

Abstract

We report magnetic properties of (La0.6Ca0.4MnO3)/x(CuO) compounds in terms of isothermal magnetization analysis and scaling behavior with various critical exponents in the vicinity of the PM to FM transition region. According to the Banerjee criterion, we found that the FM–PM phase transition is the type of SOMT. Moreover, the critical exponents β, γ, and δ are determined using the modified Arrott-plot (MAP), the Kouvel–Fisher method (KF), as well as the critical isotherm (CI) analysis. The estimated results are close to those expected for three-dimensional Heisenberg class with short-range interaction. From the field dependence of RCP and ΔS M, it was possible to evaluate the critical exponents of the magnetic phase transition. These values are in good agreement with those obtained from the critical exponents using the Kouvel–Fisher plot (KF). Finally, we used the scaling hypotheses to scale the heat capacity changes to a single universal curve for (La0.6Ca0.4MnO3)/x(CuO) composites.

Keywords

Ceramic composites Critical exponents Phase transition Magnetocaloric effect 

Notes

Acknowledgments

This work is performed with in the frame work of collaboration and is supported by the Tunisian Ministry of Higher Education and Scientific Research and Technology and Higher Education, Scientific of French.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • M. Nasri
    • 1
    • 2
  • J. Khelifi
    • 1
    • 3
  • M. Triki
    • 1
  • E. Dhahri
    • 1
  • E. K. Hlil
    • 4
  1. 1.Laboratoire de Physique Appliquée, Faculté des SciencesUniversité de SfaxSfaxTunisie
  2. 2.Unité de recherche Valorisation et optimisation de l’exploitation des ressources, Faculté des Sciences et Techniques de Sidi BouzidCampus Universitaire Cité AgricoleSidi BouzidTunisie
  3. 3.Faculté des Sciences de GafsaCampus Universitaire Sidi Ahmed ZarrougGafsaTunisie
  4. 4.Institut NéelCNRS–Université J. FourierGrenobleFrance

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