Critical behavior and large magnetocaloric effect in La0.8K0.175Li0.025MnO3 nanopowder manganite

IF 1.6 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER The European Physical Journal B Pub Date : 2024-12-21 DOI:10.1140/epjb/s10051-024-00846-6

Y. Regaieg, W. Cheikhrouhou-Koubaa, L. Sicard, E. K. Hlil

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Abstract

The rhombohedral La_0.8K_0.175Li_0.025MnO₃ 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 \(\beta \) = 0.533 and \(\gamma \) = 1.114 at \({T}_{C}\) ~ 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.