A-site-deficiency effect on critical behavior in the Pr0.6Sr0.4MnO3 compound

Abstract

We present the effect of vacancy in Pr_0.6Sr_0.4MnO₃via dc magnetisation measurements. Using various techniques such as modified Arrott plots, the Kouvel–Fisher method, and Widom scaling relationship the values of T_C (ferromagnetic transition temperature), as well as the β, γ and δ (critical exponents) are estimated. Critical exponents for the stoichiometric sample and the strontium deficient sample match well with those predicted for the tricritical mean field model. The vacancy in Pr_0.5□_0.1Sr_0.4MnO₃ changes the universal class. The estimated critical exponents of the praseodymium deficient sample are close to those found out by the 3D-Ising model.