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February 20, 2016
The paper "Critical behavior near the ferromagnetic–paramagnetic phase transition temperature of Pr0.67Ba0.33Mn1−xFexO3 (x=0 and 0.05) manganite" has been published in Journal of Magnetism and Magnetic Materials
You can find here the paper by Michel Boudard. This is the abstract: "Critical behavior of Pr0.67Ba0.33Mn1xFexO3 (x¼0 and 0.05) perovskite-manganites is studied around their Curie temperatures (TC). Results reveal that the two samples undergo a second-order phase transition. The estimated critical exponents obtained for x¼0 sample are close to the tricritical mean-field model (β=0.24670.002, γ=1.03070.018 and δ=5.069 at TC=201 K). Whereas for x¼0.05 sample, these exponents are close to the mean-field model (β=0.50170.026, γ=1.00770.002 and δ=2.920 at TC=128 K). These critical exponents fulfill the Widom scaling relation δ=1+γ/β, implying the reliability of our values. Based on the critical exponents, the magnetization–field–temperature (M–H–T) data + with ε around TC collapses into two curves obeying the single scaling equation MHf H =(T–TC)/TC is the reduced temperature."