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Magnetochemistry 2017, 3(3), 28; https://doi.org/10.3390/magnetochemistry3030028

Critical Behavior of La0.8Ca0.2Mn1−xCoxO3 Perovskite (0.1 ≤ x ≤ 0.3)

1
Department of Chemistry and Earth Sciences, College of Arts and Sciences, Qatar University, P.O. Box 2713, Doha, Qatar
2
Central Laboratory Unit, Qatar University, P.O. Box 2713, Doha, Qatar
3
Chemical Engineering Program, Texas A&M University at Qatar, P.O. Box 23874, Doha, Qatar
4
Institut Néel, CNRS, Université Grenoble Alpes, 25 rue des Martyrs BP 166, 38042 Grenoble CEDEX 9, France
5
Department of Physics, The University of Jordan, Amman 11942, Jordan
6
Faculty of Sciences of Sfax, Department of Physics, University of Sfax, B.P. 1171, Sfax 3000, Tunisia
7
National Engineering School of Sfax, Department of Mechanical Engineering, University of Sfax, B.P.W, Sfax 3038, Tunisia
*
Authors to whom correspondence should be addressed.
Received: 16 May 2017 / Revised: 3 September 2017 / Accepted: 8 September 2017 / Published: 19 September 2017
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Abstract

The critical properties of La0.8Ca0.2Mn1−xCoxO3 (x = 0, 0.1, 0.2 and 0.3) compounds were investigated by analysis of the magnetic measurements in the vicinity of their critical temperature. Arrott plots revealed that the paramagnetic PM-ferromagnetic (FM) phase transition for the sample with x = 0 is a first order transition, while it is a second order transition for all doped compounds. The critical exponents β, γ and δ were evaluated using modified Arrott plots (MAP) and the Kouvel-Fisher method (KF). The reliability of the evaluated critical exponents was confirmed by the Widom scaling relation and the universal scaling hypothesis. The values of the critical exponents for the doped compounds were consistent with the 3D-Heisenberg model for magnetic interactions. For x = 0.1, the estimated critical components are found inconsistent with any known universality class. In addition, the local exponent n was determined from the magnetic entropy change and found to be sensitive to the magnetic field in the entire studied temperature range. View Full-Text
Keywords: manganites; critical behavior; critical exponents; local exponents manganites; critical behavior; critical exponents; local exponents
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Turki, D.; Ghouri, Z.K.; Al-Meer, S.; Elsaid, K.; Ahmad, M.I.; Easa, A.; Remenyi, G.; Mahmood, S.; Hlil, E.K.; Ellouze, M.; Elhalouani, F. Critical Behavior of La0.8Ca0.2Mn1−xCoxO3 Perovskite (0.1 ≤ x ≤ 0.3). Magnetochemistry 2017, 3, 28.

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