A-site-deficiency effect on critical behavior in the Pr_0.6Sr_0.4MnO₃ compound

Abstract

We present the effect of vacancy in Pr0.6Sr0.4MnO3via dc magnetisation measurements. Using various techniques such as modified Arrott plots, the Kouvel-Fisher method, and Widom scaling relationship the values of TC (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 Pr0.5□0.1Sr0.4MnO3 changes the universal class. The estimated critical exponents of the praseodymium deficient sample are close to those found out by the 3D-Ising model.

Study of the correlation between the magnetic and electrical properties of the La0.6Sr0.4MnO3 compound

“…The ttings of the experimental curves of resistance R(T), with the eqn ( 5)- (7), show, in Fig. S3 (see ESI), † a good agreement between the experiment and the chosen model.…”

“…Thus, the resistivity is oen described by a polynomial in T, of the form r(T) = r 0 + P r n T n , where r 0 is the residual resistivity, at T = 0 K, caused by grain boundaries. 61,62 Based on previous work, [63][64][65][66][67][68][69] we choose to work with the models described by the eqn ( 5) and ( 6) based on the Zener Double Exchange (ZDE) polynomial law and eqn (7) based on the Small Polaron Conduction Mechanism (SPCM): 70 r(T) = r 0 + r 2 T 2 + r 4.5 T 4. 5 (5)…”

“…This leads to a very rich phase diagram involving various metallic, insulating and magnetic phases. [1][2][3][4][5][6][7] At high temperature, the paramagnetic (PM) phase has been detected. However, at low temperatures, both antiferromagnetic (AFM) and ferromagnetic (FM) phases have been observed.…”

Magneto-optical imaging of stepwise magnetic domain disintegration at characteristic temperatures in EuB6

“…It is known that critical scaling exponents near a critical transition temperature are expected to yield information about the nature of magnetic interactions in the system and the universality class associated with the phase transition [34]. models, while they seem to be close to that for the tricritical mean field model ( = 0.25,  =1, and  = 5) [36,37] though not identical to it. We show in fig.…”