Cationic Mismatch Effect Induced by Double Substitution on the Structural and Magnetic Properties of La<sub>0.5</sub>Ca<sub>0.5</sub>MnO<sub>3</sub>

Cationic Mismatch Effect Induced by Double Substitution on the Structural and Magnetic Properties of La<sub>0.5</sub>Ca<sub>0.5</sub>MnO<sub>3</sub>

In this study, we aimed to induce controlled structural disorder through a double substitution approach in the La<sub>0.5</sub>Ca<sub>0.5</sub>MnO<sub>3</sub> compound by investigating La<sub>0.5−<i>x</i></sub>Re<i><sub>x</su...

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Bibliographic Details
Main Authors: Wadie Abdelhedi, Akram Krichene, Wahiba Boujelben, Nassira Chniba-Boudjada
Format: Article
Language:English
Published: MDPI AG 2025-04-01
Series:Magnetochemistry
Subjects:
magnetic transition
Griffiths phase
phase separation
cationic disorder
Online Access:https://www.mdpi.com/2312-7481/11/5/36
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Summary:In this study, we aimed to induce controlled structural disorder through a double substitution approach in the La<sub>0.5</sub>Ca<sub>0.5</sub>MnO<sub>3</sub> compound by investigating La<sub>0.5−<i>x</i></sub>Re<i><sub>x</sub></i>Ca<sub>0.5−<i>y</i></sub>Ae<i><sub>y</sub></i>MnO<sub>3</sub> compounds with <i>x</i> = 0.05 and 0.1 and Re = Eu, Nd, Gd, Pr, and Ae = Ba and Sr. The y values are adjusted to maintain a constant average ionic radius (<<i>r<sub>A</sub></i>> = 1.198 Å) and an unchanged Mn<sup>3+/</sup>Mn<sup>4+</sup> ratio. These samples were synthesized using the sol–gel method. XRD analysis confirms structural stability despite the induced disorder, showing subtle lattice distortions. Magnetic measurements reveal that introducing low disorder annihilates the charge ordered (CO) state, enhances double-exchange interactions, and influences the ferromagnetic (FM) volume fractions. Moderate disorder strengthens AFM–CO state, triggering a first–order metamagnetic transition and reducing the Curie temperature value. Magnetic field-dependent magnetization data show disorder dependent magnetic behavior and suggest the presence of the Griffiths phase for all samples, confirming the role of structural disorder in tuning magnetic phase coexistence. Pr-based samples display a considerable magnetocaloric effect near their Curie temperature.
ISSN:2312-7481

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