Sintering temperature effect on the magnetic interactions in Pr 0.67 Sr 0.33 MnO 3 manganite
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ORIGINAL PAPER: MODELLING, COMPUTATIONAL TOOLS AND THEORETICAL STUDIES OF SOL-GEL AND HYBRID MATERIALS
Sintering temperature effect on the magnetic interactions in Pr0.67Sr0.33MnO3 manganite W. Mabrouki1 A. Krichene ●
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N. Chniba Boudjada1,2 W. Boujelben1 ●
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Received: 6 April 2020 / Accepted: 10 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this work, we report the effect of sintering temperature (TS) on the magnetic interactions and the critical behavior of Pr0.67Sr0.33MnO3 manganite prepared via sol–gel method (700 °C ≤ TS ≤ 1200 °C). The critical exponents study revealed that the 3D-Ising model is the best model to describe the magnetic interactions in the P1000 (TS = 1000 °C) and P1200 (TS = 1000 °C) samples. Consequently, a strong magnetic anisotropy characterizes these samples near the paramagneticferromagnetic transition temperature, such anisotropy can be linked to the magnetic moment of Pr3+ ions (µ = 3.58 µB). For TS ≤ 850 °C, it becomes nearly impossible to speak about universality class due to the presence of great magnetic disorder induced by several factors like spin disordered shell in nanoparticles, magnetic frustration and Griffiths phase. Graphical Abstract
Keywords
Manganites Sintering temperature Critical exponents 3D-Ising ●
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Highlights Pr0.67Sr0.33MnO3 manganite was prepared by sol–gel route with different sintering temperature (Ts) values. ● 3D-Ising model can describe the magnetic behavior for Ts > 850 °C. ● The critical analysis for nanosized specimens is not possible due to the spin disorder. ●
* A. Krichene [email protected] 1
Laboratoire de Physique des Matériaux, Faculté des Sciences de Sfax, Université de Sfax, B.P. 1171, 3000 Sfax, Tunisia
2
Université Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France
1 Introduction The perovskite type manganite of general formula R1−xAx MnO3 (R = trivalent rare earth and A = divalent alkaline earth) were intensively investigated experimentally and theoretically. These compounds present several interesting physical properties [1–6]. The observed properties are
Journal of Sol-Gel Science and Technology
highly linked to the reduction of grain size to the nanometer scale [6–8]. In fact, the basic magnetic properties of bulk materials become significantly different when particle size gets highly reduced [6–9]. The nanoscaled manganites are interesting systems to study and their physical properties can be exploited for several technological applications like magnetic recording, catalysis, ferrofluids, magnetic refrigeration, spintronics, magnetic field sensing, etc. The perovskite manganites are also characterized by a variety of theoretical models used to describe the physical properties as well as the interactions between spins [5, 10–12]. The double exchange mechanism was found responsible for ferromagnetism in manganites. First, the critical behavior based on double exchange mechanism was described according to the mean-field theor
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