Critical phenomena in Pr0.6Sr0.4MnO3 perovskite manganese oxide

We studied the critical phenomena of perovskite-manganite compound Pr0.6Sr0.4MnO3 around its Curie temperature. Experimental results based on magnetic measurements using Banerjee criterion revealed that the sample exhibits the second-order paramagnetic–ferromagnetic transition. It is found that the critical behaviour analysis and Kouvel–Fisher method show that the 3D- Heisenberg model is the best one to describe the critical phenomena around the critical point. Critical exponents β = 0.3785(6) and γ = 1.304(12) at TC = 320 K are obtained. The critical exponent δ = 4.7183(2) is determined separately from the isothermal magnetization at TC. These critical exponents fulfil the Widom scaling relation δ = 1 + γ/β. Based on the critical exponents, the magnetization–field–temperature (M–H–T) data around TC collapses into two curves obeying the single scaling equation M(H,ε)=β|ε|f±(H/|ε|β+γ)M(H,ε)=|ε|βf±(H/|ε|β+γ) with ε = (T − TC)/TC is the reduced temperature.

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