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Critical exponents and magnetic entropy change across the continuous magnetic transition in (La, Pr)-Ba manganites

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Abstract

The critical behavior and magnetocaloric effect (MCE) in the perovskite system La0.7−xPrxBa0.3MnO3 (x = 0.05, and 0.15) have been carefully investigated via dc-magnetization measurement. With the increase in Pr-doping, the universality class shifts from the predicted 3d-Heisenberg model characterized by a short-range coupling [β = 0.371 ± 0.008, γ = 1.351 ± 0.002 and δ = 4.634 ± 0.002, for x = 0.05] to an unknown one [β = 0.385 ± 0.004, γ = 1.324 ± 0.001 and δ = 4.435 ± 0.006, for x = 0. 15]. The critical exponents, however, obey the scaling behavior for both samples. Likewise, this series of compounds displays rescaled magnetic entropy data that plead in favor of a non-universal MCE behavior. Moreover, the field dependence of the magnetic entropy change (ΔSM) gives rise to critical exponents (β and γ) which are not consistent with that estimated through the critical behavior. Unexpectedly, the renormalization group approach revealed critical exponents for both samples comparable to those calculated for 3dXY spin interactions. All three exponents vary with Pr concentration, indicating the violation of both universality and weak universality hypotheses that may lead to several critical points. The unconventional outcomes suggest that, in addition to the correlation between quenched disorder and accommodation strain, magnetic anisotropy plays a major role with increasing Pr − x, opposing the exchange mechanisms. Pr − x enhanced the peak of ΔSM around TC and the relative cooling power (RCP). The broad operating temperature range along with a negligible hysteresis make Pr − 15% a promising candidate for magnetic refrigerant material near room temperature.

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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was funded by the Deanship of Scientific Research at Jouf University under grant No (DSR-2021-03-0223). The authors would like to extend their sincere appreciation to the central laboratory at Jouf University for supporting this study.

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Authors and Affiliations

  1. Physics Department, College of Science, Jouf University, P.O. Box 2014, Sakaka, Saudi Arabia

    Anowar Tozri, W. S. Mohamed & J. Laifi

  2. Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de Sfax, B.P 1171, 3000, Sfax, Tunisia

    R. Kamel & E. Dhahri

  3. Univ. Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000, Grenoble, France

    E. K. Hlil

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  1. Anowar Tozri
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AT: conception, design of study, writing—review and editing. RK: writing—original draft. WSM: writing—review and editing. JL: visualization and investigation. ED: writing—review and editing. EKH: data curation, visualization and investigation.

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Tozri, A., Kamel, R., Mohamed, W.S. et al. Critical exponents and magnetic entropy change across the continuous magnetic transition in (La, Pr)-Ba manganites. Appl. Phys. A 128, 575 (2022). https://doi.org/10.1007/s00339-022-05719-2

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