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<p>In this paper, we systematically study the magnetic critical behavior and magnetocaloric properties of pure parent LaMnO<sub>3</sub> with hexagonal structure for the first time. By comparing the critical exponents obtained by the self-consistent method (modified Arrott plots, MAP) with the results derived from the Kouvel–Fisher (KF) relationship, the critical exponents of MAP is more reliable, and the critical behavior of LaMnO<sub>3</sub> is consistent with the mean field model. Moreover, it is found that the negative entropy change (− Δ<i>S</i><sub>M</sub>) reaches 4.18&#xa0;J/kg·K at 255&#xa0;K under 50 kOe field, and the relative cooling power (RCP) reaches 206.89&#xa0;J/kg. Compared with other parent materials, the hexagonal LaMnO<sub>3</sub> prepared in this work show a larger − Δ<i>S</i><sub>M</sub> across the entire magnetic field range. The appearance of the maximum values of − Δ<i>S</i><sub>M</sub> near Curie temperature (<i>T</i><sub>C</sub> = 245&#xa0;K) is related to magnetic phase transition. In addition, the calculated temperature-averaged entropy change (TEC) and normalized refrigerant capacity (NRC) further confirm its potential for magnetic refrigeration. These physical properties indicate the potential of hexagonal parent LaMnO<sub>3</sub> for magnetic refrigeration applications.</p>

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Magnetic and magnetocaloric properties in hexagonal parent LaMnO3

  • 期刊论文

  • 发表日期：

    2026年4月14日

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  • Junran Li,
  • Juechi Li,
  • Weishi Tan,
  • Shuai Huang,
  • Kunpeng Su,
  • Lin Yang,
  • Haiou Wang

摘要

In this paper, we systematically study the magnetic critical behavior and magnetocaloric properties of pure parent LaMnO3 with hexagonal structure for the first time. By comparing the critical exponents obtained by the self-consistent method (modified Arrott plots, MAP) with the results derived from the Kouvel–Fisher (KF) relationship, the critical exponents of MAP is more reliable, and the critical behavior of LaMnO3 is consistent with the mean field model. Moreover, it is found that the negative entropy change (− ΔSM) reaches 4.18 J/kg·K at 255 K under 50 kOe field, and the relative cooling power (RCP) reaches 206.89 J/kg. Compared with other parent materials, the hexagonal LaMnO3 prepared in this work show a larger − ΔSM across the entire magnetic field range. The appearance of the maximum values of − ΔSM near Curie temperature (TC = 245 K) is related to magnetic phase transition. In addition, the calculated temperature-averaged entropy change (TEC) and normalized refrigerant capacity (NRC) further confirm its potential for magnetic refrigeration. These physical properties indicate the potential of hexagonal parent LaMnO3 for magnetic refrigeration applications.