Modelling the Magnetocaloric Effect Arising from critical Behavior of Tb2Rh3Ge Rare-Earth
Abstract
In this paper, we investigated the critical behavior during the transition from the ferromagnetic to
paramagnetic phase in Tb2Rh3Ge rare-earth. Utilizing the Landau theory, we produced isothermal
magnetization curves, M(H,T), in the vicinity of the ferromagnetic-to-paramagnetic phase transition.
Through an iterative program utilizing the Kouvel-Fisher method, we determined the optimized critical
exponents to be: γ=1.003; β=0.348. These critical exponents are clear and reasonably consistent, although
they do not align with the conventional universality classes. We have successfully simulated the magnetic
entropy change curves by combining the Arrott-Noakes equation with the Landau model.
Keywords
Magnetizations; Critical behavior; Landau model; Spontaneous magnetization; Modified Arrott plot.