Modeling the Magnetocaloric Effect of La{sub 0.67}Pb{sub 0.33}MnO{sub 3} by the Mean-Field Theory
- University of Monastir, Laboratory of Physical Chemistry of Materials, Faculty of Science of Monastir, Department of Physics (Tunisia)
- Aljouf University, Physics Department, Faculty of Science (Saudi Arabia)
In this paper, a theoretical analysis linked to the molecular field theory and the Bean-Rodbell model has investigated the magnetocaloric effect (MCE) in a La{sub 0.67}Pb{sub 0.33}MnO{sub 3} sample. We have demonstrated how the mean-field model can adequately simulate the magnetic and magnetocaloric properties of this magnetic system, which may be a candidate material to magnetic refrigerants. The second-order ferromagnetic (FM)-paramagnetic (PM) phase transition has been confirmed. The expressions describing the entropy and its change under the influence of the magnetic field have been derived. A scaling method based on the mean-field theory leads to a direct calculation of the exchange parameter (λ), the saturation magnetization (M{sub 0}), the total angular momentum (J), and the gyromagnetic factor (g) of our sample. These constants were used to simulate M(H,T) isotherms, which are used again for the determination of the magnetic entropy change (−ΔS{sub M}) of La{sub 0.67}Pb{sub 0.33}MnO{sub 3}.
- OSTI ID:
- 22773640
- Journal Information:
- Journal of Superconductivity and Novel Magnetism, Journal Name: Journal of Superconductivity and Novel Magnetism Journal Issue: 11 Vol. 31; ISSN 1557-1939
- Country of Publication:
- United States
- Language:
- English
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