Critical Behavior of La0.67Ba0.33Mn0.95Fe0.05O3 Manganite
Tóm tắt
The critical behavior of perovskite manganite La0.67Ba0.33Mn0.95Fe0.05O3 at the ferromagnetic–paramagnetic has been analyzed. The results show that the sample exhibited the second-order magnetic phase transition. The estimated critical exponents derived from the magnetic data using various such as modified d’Arrott plot Kouvel–Fisher method and critical magnetization M(T
C, H). The critical exponents values for the La0.67Ba0.33Mn0.95Fe0.05O3 are close to those expected from the mean field model β = 0.504 ± 0.01 with T
C
= 275661 ± 0.447 (from the temperature dependence of the spontaneous magnetization below T
C
), γ = 1.013 ± 0.017 with T
C
= 276132 ± 0.452 (from the temperature dependence of the inverse initial susceptibility above T
C
), and δ = 3.0403 ± 0.0003. Moreover, the critical exponents also obey the single scaling equation of M(H, ε) = |ε|
β
f
±(H/|ε|
β+γ
).
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