https://doi.org/10.1140/epjb/s10051-024-00846-6
Regular Article - Solid State and Materials
Critical behavior and large magnetocaloric effect in La0.8K0.175Li0.025MnO3 nanopowder manganite
1
LT2S Lab, Digital Research Center of Sfax, Sfax Technoparc, 3021, Sfax, Tunisia
2
Faculty of Sciences of Gafsa, University of Gafsa, 2112, Gafsa, Tunisia
3
ITODYS, Université Paris Diderot, UMR 7086 CNRS, 75205, Paris Cedex 13, France
4
Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000, Grenoble, France
Received:
18
September
2024
Accepted:
11
December
2024
Published online:
21
December
2024
The rhombohedral La0.8K0.175Li0.025MnO3 sample was elaborated using the sol–gel method at low temperature of 900 °C. The prepared sample exhibits a second-order paramagnetic-ferromagnetic transition with decreasing temperature. Based on the data of the magnetic measurements, the critical behavior analysis is investigated through various techniques such as modified Arrott plot, Kouvel–Fisher method and critical isotherm analysis. The critical exponents determined using the Kouvel-Fisher method are found to be 
= 0.533 and 
= 1.114 at 
~ 270 K. The critical exponent values obtained are in agreement with the values predicted by the mean field model, indicating the existence of long-range magnetic interaction in our synthesized sample. The maximum of the magnetic entropy change is about 3.51 J kg−1 K−1 under a magnetic applied field change of 5 T. The relative cooling power is found to be 320.5 J kg−1 at 5 T. This value represents about 78% of that of standard gadolinium.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2024
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
