Critical behavior at high magnetic fields in LaPr(Ca,Sr)MnO manganites

In this work, we demonstrate that La0.225Pr0.4(Ca1-xSrx)(0.375)MnO3 manganites with 0 <= x <= 0.10, exhibit a discontinuous first order ferromagnetic-paramagnetic transition at temperatures similar to 230-240 K, which evolves to a continuous second order ferromagnetic-paramagnetic transition according to the intensity of the applied magnetic field. Under high magnetic fields and through a magnetization scaling analysis, we have determined the critical exponents of the sample with x = 0.05 - beta = 0.15, gamma = 0.77, and delta = 6.24, and x = 0.10 - beta = 0.165, gamma = 0.62, and delta = 4.69. The exponents values obey the scaling laws but do not belong to any existing universality class. This analysis of critical behavior can be used to predict the magnetic entropy change under high magnetic fields.

Automated summary

The study demonstrates a discontinuous first order ferromagnetic-paramagnetic transition in La0.225Pr0.4(Ca1-xSrx)(0.375)MnO3 manganites with 0 <= x <= 0.10 at temperatures around 230-240 K, evolving to a continuous second order transition under high magnetic fields. Critical exponents were determined through magnetization analysis and found to not belong to any existing universality class, providing insights for predicting magnetic entropy change under high magnetic fields.