Critical behavior and magnet effect simulation in La1-xTexMnO3 manganites

Abstract

This study presents a detailed analysis of the critical behavior in Te-doped La_1-xTe_xMnO₃ (x = 0.05–0.2), highlighting the influence of doping on magnetic interactions and critical phenomena. A significant novelty of this work lies in the use of an iterative refinement of critical exponents via Modified Arrott Plots (MAPs) and the Kouvel–Fisher method, revealing a deviation from the mean-field-like universality class. The critical exponents values evolve with increasing Te concentration, underscoring the tunability of magnetic interactions through chemical doping. Additionally, numerical simulations were employed to reproduce magnetization isotherms, and observed discrepancies at low magnetic fields were attributed to thermodynamic fluctuation effects not captured by classical models. The magnetic entropy change, with a peak value of 3.8 J.kg^-1·K^-1 at 5 T for x = 0.1, was derived both via the Landau theory and Maxwell relation, showing excellent agreement. This work contributes a comprehensive framework for analyzing critical phenomena in manganites and demonstrates a pathway to engineer magnetic transitions via controlled doping.