Correlation between magnetic and electrical properties of La 0.7 Ba 0.15 Ag 0.15 MnO 3 manganite prepared by sol gel met
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Correlation between magnetic and electrical properties of La0.7Ba0.15Ag0.15MnO3 manganite prepared by sol gel method Sobhi Hcini1 · Fakher Hcini1,2 · Mohamed Lamjed Bouazizi3 · Sadok Zemni2 Received: 9 April 2020 / Accepted: 1 June 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract We have reported the solgel synthesis, the structural analysis, and the correlation between magnetic and electrical properties of L a0.7Ba0.15Ag0.15MnO3 manganite. The phase purity and structure of this sample were checked by X-ray diffraction technique and Rietveld analysis. M(T) measurement shows a ferromagnetic (FM)-to-paramagnetic (PM) phase transition of second-order type at Curie temperature TC = 255 K. The obtained magnetocaloric parameters offer to the sample the possible use in the magnetic refrigeration technology. The resistivity data, ρ(μ0H, T), show the presence of metal–semiconductor transition and a maximum magnetoresistance (MR) value of the order of 32% at magnetic field of 5 T. The phenomenological percolation model was used to study the conduction mechanism of the sample. It has been also shown that, from analyzing the temperature and magnetic field dependences of the electrical resistivity, it is possible to predict the behavior of the magnetization as well as the change of magnetic entropy near the phase transition temperature. The obtained agreement with experimental data for this analysis is quite reasonable. Keywords Manganites · Structural analysis · Magnetic properties · Magnetoresistance · Percolation theory · Magnetic entropy change
1 Introduction The manganites with perovskite structure adopting Ln1−xMxMnO3 as general formula (Ln is a trivalent rare earth element and M is a monovalent or divalent ion) are complex materials due to their extremely high chemical stability over a wide range of compositions which leads to numerous modifications in their properties. These materials have been widely studied in recent years to find out more and understand the different possible interactions within this
* Sobhi Hcini [email protected] 1
Research Unit of Valorization and Optimization of Exploitation of Resources, Faculty of Science and Technology of Sidi Bouzid, Kairouan University, 9100 Sidi Bouzid, Tunisia
2
Laboratory of Physical Chemistry of Materials, Physics Department, Faculty of Sciences of Monastir, Monastir University, 5019 Monastir, Tunisia
3
Department of Mechanical Engineering, College of Engineering, Prince Sattam Bin Abdulaziz University, Alkharj 11942, Saudi Arabia
structure rendered complex by the mixed valence of manganese (Mn3+/Mn4+). In particular, the study of manganese perovskites experienced a renewed interest with the discovery of what is called colossal magnetoresistance (CMR) [1]. This property entails a radical change in electrical resistivity when a magnetic field is applied to these materials. This feature makes them interesting for many potential applications such as hard disk read heads [2], oxygen permeation membranes and magnetic field
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