We report the results of ac/dc magnetization study of the critical behavior in a weak ferromagnet BaIrO3. The critical temperature has been determined to be Tc=182.8 K by the ac susceptibility measurement. We have analyzed our dc magnetization data near Tc with the help of the modified Arrott plot method. The critical exponents have been determined to be β=0.820.03, γ=1.030.03, and δ=2.200.01, which roughly obeys δ=γ/β+1. Using these values of Tc, β, and γ, we find that each magnetization-field-temperature (M-H-T) behavior below and above Tc obeys a scaling relation, following a single equation of state in which M/|ε|β is uniquely related to H/|ε|(γ+β) where ε≡(T-T c)/Tc. These findings demonstrate that the ferromagnetic transition in BaIrO3 belongs to a new universality class of the second-order phase transition.
ASJC Scopus subject areas
- Physics and Astronomy(all)