Critical behavior in Co-doped manganites La0.67Pb0.33Mn1-xCoxO3 (0 ≤ x ≤ 0.08)
Identifieur interne : 000456 ( Main/Exploration ); précédent : 000455; suivant : 000457Critical 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.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Dopage.
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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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Dhahri</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Unité de Recherche de Physique des Solides, Département de Physique, Faculté des Sciences de Monastir</s1><s2>5019</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Tunisie</country><wicri:noRegion>5019</wicri:noRegion></affiliation></author><author><name sortKey="Dhahri, J" sort="Dhahri, J" uniqKey="Dhahri J" first="J." last="Dhahri">J. Dhahri</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Unité de Recherche de Physique des Solides, Département de Physique, Faculté des Sciences de Monastir</s1><s2>5019</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Tunisie</country><wicri:noRegion>5019</wicri:noRegion></affiliation></author><author><name sortKey="Hlil, E K" sort="Hlil, E K" uniqKey="Hlil E" first="E. K." last="Hlil">E. K. Hlil</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Institut Néel, CNRS-Université J. Fourier, B.P. 166</s1><s2>38042 Grenoble</s2><s3>FRA</s3><sZ>3 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Auvergne-Rhône-Alpes</region><region type="old region" nuts="2">Rhône-Alpes</region><settlement type="city">Grenoble</settlement></placeName></affiliation></author><author><name sortKey="Dhahri, E" sort="Dhahri, E" uniqKey="Dhahri E" first="E." last="Dhahri">E. Dhahri</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Laboratoire de Physique Appliqué, Département de Physique, Faculté des Sciences de Sfax</s1><s2>3018</s2><s3>TUN</s3><sZ>4 aut.</sZ></inist:fA14><country>Tunisie</country><wicri:noRegion>3018</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Journal of magnetism and magnetic materials</title><title level="j" type="abbreviated">J. magn. magn. mater.</title><idno type="ISSN">0304-8853</idno><imprint><date when="2012">2012</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of magnetism and magnetic materials</title><title level="j" type="abbreviated">J. magn. magn. mater.</title><idno type="ISSN">0304-8853</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Arrott plot</term><term>Cobalt additions</term><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></keywords><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></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Dopage</term></keywords></textClass></profileDesc></teiHeader><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></TEI><affiliations><list><country><li>France</li><li>Tunisie</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Rhône-Alpes</li></region><settlement><li>Grenoble</li></settlement></list><tree><country name="Tunisie"><noRegion><name sortKey="Dhahri, N" sort="Dhahri, N" uniqKey="Dhahri N" first="N." last="Dhahri">N. Dhahri</name></noRegion><name sortKey="Dhahri, E" sort="Dhahri, E" uniqKey="Dhahri E" first="E." last="Dhahri">E. Dhahri</name><name sortKey="Dhahri, J" sort="Dhahri, J" uniqKey="Dhahri J" first="J." last="Dhahri">J. Dhahri</name></country><country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Hlil, E K" sort="Hlil, E K" uniqKey="Hlil E" first="E. K." last="Hlil">E. K. Hlil</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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