Critical behavior in Co-doped manganites La0.67Pb0.33Mn1-xCoxO3 (0 ≤ x ≤ 0.08)
Identifieur interne : 000458 ( Main/Merge ); précédent : 000457; suivant : 000459Critical behavior in Co-doped manganites La0.67Pb0.33Mn1-xCoxO3 (0 ≤ x ≤ 0.08)
Auteurs : N. Dhahri [Tunisie] ; J. Dhahri [Tunisie] ; E. K. Hlil [France] ; E. Dhahri [Tunisie]Source :
- Journal of magnetism and magnetic materials [ 0304-8853 ] ; 2012.
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- Pascal (Inist)
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- topic : Dopage.
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- KwdEn :
Abstract
The critical properties of perovskite manganite La0.67Pb0.33Mn1-xCOxO3 (0 ≤ x ≤ 0.08) around the paramagnetic-ferromagnetic phase transition are investigated through various techniques such as the modified Arrott plot, Kouvel-Fisher method and critical isotherm analysis. Though the nature of this transition was found to be in second order, the estimated critical exponents β (0.233 ≤ β ≤ 0.368), γ (1.03 ≤γ≤ 1.40) and δ (4.32 < δ ≤ 5.54) are in between the theoretically predicted values for three-dimensional Heisenberg and tricritical mean-field model. This model suggests the coexistence of the short-range and long-range ferromagnetic orders around the critical temperature. The values of the critical exponents obtained from different methods and the well-obeyed scaling behavior confirm that the calculated exponents are unambiguous and purely intrinsic to the system.
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Pb<sub>0.33</sub>
Mn<sub>1-x</sub>
Co<sub>x</sub>
O<sub>3 </sub>
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<term>Critical exponents</term>
<term>Critical phenomena</term>
<term>Critical points</term>
<term>Doping</term>
<term>Ferromagnetic-paramagnetic transitions</term>
<term>Heisenberg model</term>
<term>Impurity density</term>
<term>Long-range order</term>
<term>Magnetization</term>
<term>Manganites</term>
<term>Mean field approximation</term>
<term>Perovskites</term>
<term>Scaling laws</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Phénomène critique</term>
<term>Dopage</term>
<term>Transition ferromagnétique paramagnétique</term>
<term>Exposant critique</term>
<term>Modèle Heisenberg</term>
<term>Approximation champ moyen</term>
<term>Concentration impureté</term>
<term>Ordre longue distance</term>
<term>Point critique</term>
<term>Loi échelle</term>
<term>Addition cobalt</term>
<term>Aimantation</term>
<term>Manganite</term>
<term>Perovskites</term>
<term>Diagramme d'Arrott</term>
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<front><div type="abstract" xml:lang="en">The critical properties of perovskite manganite La<sub>0.67</sub>
Pb<sub>0.33</sub>
Mn<sub>1-x</sub>
CO<sub>x</sub>
O<sub>3</sub>
(0 ≤ x ≤ 0.08) around the paramagnetic-ferromagnetic phase transition are investigated through various techniques such as the modified Arrott plot, Kouvel-Fisher method and critical isotherm analysis. Though the nature of this transition was found to be in second order, the estimated critical exponents β (0.233 ≤ β ≤ 0.368), γ (1.03 ≤γ≤ 1.40) and δ (4.32 < δ ≤ 5.54) are in between the theoretically predicted values for three-dimensional Heisenberg and tricritical mean-field model. This model suggests the coexistence of the short-range and long-range ferromagnetic orders around the critical temperature. The values of the critical exponents obtained from different methods and the well-obeyed scaling behavior confirm that the calculated exponents are unambiguous and purely intrinsic to the system.</div>
</front>
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