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  4. Critical parameters near the phase transition temperature in La0.67-xDyxPb0.33MnO3

稀土学报(英文版), 2015, (2): 168-176. doi: 10.1016/S1002-0721(14)60398-7

N Zaidi 1, , S Mnefgui 2, , A Dhahri 3, , EK Hlil 4, , J Dhahri 5,

1.Laboratory of Condensed Mat er and Nanosciences, University of Monastir, 5019, Tunisia

2.Laboratory of Condensed Mat er and Nanosciences, University of Monastir, 5019, Tunisia

3.Laboratory of Condensed Mat er and Nanosciences, University of Monastir, 5019, Tunisia

4.Institut Néel, CNRS and Joseph Fourier university, B.P.166, 38042 Grenoble, France

5.Laboratory of Condensed Mat er and Nanosciences, University of Monastir, 5019, Tunisia

Critical parameters near the phase transition temperature in La0.67-xDyxPb0.33MnO3

Keywords： Arrott plots

La0.67–xDyxPb0.33MnO3 (x=0.00 and x=0.10) were elaborated by the solid state method and checked by X-ray diffraction. Close to magnetic temperature transition, the order transition and the critical behavior were investigated by dc magnetization meas-urements versus x composition. The critical properties were investigated through various techniques such as modified Arrott plot (MAP), Kouvel-Fisher (KF) method and critical isotherm (CI) analysis based on the data of static magnetic measurements recorded around the Curie temperature TC. The values of critical exponents (βandγ) estimated were found to lie between those predicted for a 3D-Ising model for x=0.00 and those of 3D-Heisenberg model for x=0.10. The reliability of the critical exponent’s values was con-firmed by the Widom scaling relation and the universal scaling hypothesis. The change in the universality class should be due to the increase of the Dy content.

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