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<p>Study of critical phenomena in materials is both fundamentally important and provides a large scope for various applications. In this work, we have investigated the nature of ferromagnetic-to-paramagnetic phase transition and critical behaviour around the magnetic phase transition temperature of La<sub>0.67</sub>Ca<sub>0.33−x</sub>Ba<sub>x</sub>MnO<sub>3</sub> (x = 0, 0.08, 0.13, 0.23 &amp; 0.33) compounds with the help of Modified Arrott Plot method. Further, analysed the results by comparing the choice of critical exponents obtained from modified Arrott plot with those of field dependent change in magnetic entropy (ΔS<sub>M</sub>). It is observed that starting with x = 0.08, a second-order ferromagnetic-to-paramagnetic phase transition is exhibited by these compounds. At lower Ba content (x = 0.08) the magnetic interactions present in the materials are well described by Mean field tricritical model whereas with increasing Ba content at Ca site, 3D nearest neighbor Heisenberg model appears to be more appropriate model describing the magnetic interactions present.</p>

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Study of Ba Doping Induced Magnetic Interactions in La0.67Ca0.33-xBaxMnO3

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Jayakumar Vishnubharathi,
  • Abhishek Kumar Singh,
  • Krishnamoorthi Chintagumpala,
  • Vandrangi Suresh Kumar

摘要

Study of critical phenomena in materials is both fundamentally important and provides a large scope for various applications. In this work, we have investigated the nature of ferromagnetic-to-paramagnetic phase transition and critical behaviour around the magnetic phase transition temperature of La0.67Ca0.33−xBaxMnO3 (x = 0, 0.08, 0.13, 0.23 & 0.33) compounds with the help of Modified Arrott Plot method. Further, analysed the results by comparing the choice of critical exponents obtained from modified Arrott plot with those of field dependent change in magnetic entropy (ΔSM). It is observed that starting with x = 0.08, a second-order ferromagnetic-to-paramagnetic phase transition is exhibited by these compounds. At lower Ba content (x = 0.08) the magnetic interactions present in the materials are well described by Mean field tricritical model whereas with increasing Ba content at Ca site, 3D nearest neighbor Heisenberg model appears to be more appropriate model describing the magnetic interactions present.