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Structural, Magnetic, Magnetocaloric, and Critical Exponent Properties of La0.67Sr0.33MnO3 Powders Synthesized by Solid-State Reaction

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Abstract

Polycrystalline La0.67Sr0.33MnO3 (LSMO) powders were prepared by solid-state reaction, and their structural, magnetic, magnetocaloric, and critical exponent properties have been investigated. X-ray diffraction has shown that the sample is polycrystalline with a rhombohedral (R-3c) structure. Scanning electron microscopy has revealed that the surface of the sample is chemically homogeneous. The samples undergo a second-order magnetic transition from a ferromagnetic to a paramagnetic state with a Curie temperature of 361 K. The maximum entropy change is determined to be 274 J/kg K for a magnetic field change of 0–5 T. For the same applied field, the adiabatic temperature change and relative cooling power are found to be 1.75 K and 242 J/kg, respectively. These values are compared with those reported in the literature. It is concluded that large grain sizes are mandatory in order to obtain high magnetic refrigeration efficiency in LSMO-based compounds. Moreover, it is shown that the critical exponent values are in agreement with those of the long-range mean field model.

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Acknowledgments

Financial support from the “PHC Maghreb” research project is gratefully acknowledged.

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Authors and Affiliations

  1. Faculté des Sciences, LPMMAT, Université Hassan II—Casablanca, B.P. 5366, Maârif, Morocco

    A. Ettayfi, R. Moubah, A. Boutahar & H. Lassri

  2. Institut Néel, CNRS, Université Joseph Fourier, BP 166, 38042, Grenoble Cedex 9, France

    A. Boutahar & E. K. Hlil

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  1. A. Ettayfi
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  2. R. Moubah
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  3. A. Boutahar
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  4. E. K. Hlil
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  5. H. Lassri
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Correspondence to R. Moubah.

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Ettayfi, A., Moubah, R., Boutahar, A. et al. Structural, Magnetic, Magnetocaloric, and Critical Exponent Properties of La0.67Sr0.33MnO3 Powders Synthesized by Solid-State Reaction. J Supercond Nov Magn 29, 133–138 (2016). https://doi.org/10.1007/s10948-015-3212-5

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  • DOI: https://doi.org/10.1007/s10948-015-3212-5

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