3D-Ising like ferromagnetism in skyrmionic-bubbles host infinite-layer La_0.825Sr_0.175MnO₃ manganite perovskite

Abstract

The critical behavior of infinite-layer La 0.825 Sr 0.175 MnO 3 of Ruddlesden-Popper series manganite has been studied around the transition temperature (T C ). To reveal the universality class that explains the critical behavior in La 0.825 Sr 0.175 MnO 3 several methods, such as modified Arrott plots, Kouvel-Fisher, entropy and critical isotherm analysis have been employed. The critical exponent δ for infinite-layer is obtained independently from critical magnetization isotherm and found to satisfy the Widom scaling relation δ = 1 + γ/β. The universality class of the critical phenomenon in infinite-layer La 0.825 Sr 0.175 MnO 3 manganite can be explained with the help of renormalization group theory approach for three dimensional (3D) systems. We have shown that a short-range 3D-Ising type interaction is responsible for ferromagnetic and second-order phase transition to paramagnetic phase.

Strain fields and critical phenomena in manganites I: spin-lattice Hamiltonians

“…In some of the samples [5,6], the observed critical behavior is comparable to the universality classes of short-range models (Ising, Heisenberg) of critical phenomena. However, the vast majority of the experimental works [1, 2,4,8,9,12,13] do not fall in the above-mentioned universality classes. Moreover, the exponent values from different experiments are not in agreement, suggesting a range of universality classes.…”