Electrical transport and magnetic properties of Mn3O4-La0.7Ca0.3MnO3 ceramic composites prepared by a one-step spray-drying technique |
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| Affiliation: | 1. SUPRATECS/LCIS, Chemistry Institute B6, University of Liege, Sart-Tilman, B-4000 Liège, Belgium;2. SUPRATECS, Department of Electrical Engineering and Computer Science B28, University of Liege, Sart-Tilman, B-4000 Liège, Belgium;3. SUPRATECS, Physics Institute B5, University of Liege, Sart-Tilman, B-4000 Liège, Belgium;1. Laboratoire de Physique des Matériaux, Faculté des Sciences de Sfax, Université de Sfax, B. P. 1171, 3000 Sfax, Tunisia;2. Department of Physics, Saurashtra University, Rajkot 360005, India;3. UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452017, India;4. UGC-DAE Consortium for Scientific Research, Mumbai Centre, B.A.R.C. Campus, Mumbai 400085, India;1. Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, BP 1171, Université de Sfax, 3000, Tunisia;2. Laboratoire des Sciences des Matériaux et de l’Environnement, Faculté des Sciences de Sfax, BP 1171, Université de Sfax, 3000, Tunisia;3. I3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal;1. Laboratoire de Physico-chimie des Matériaux, Faculté des Sciences de Monastir, Département de Physique, Université de Monastir, Monastir 5019, Tunisie;2. Laboratoire des Matériaux et du Génie Physique, Grenoble INP, CNRS (UMR 5628), MINATEC, 3 parvis Louis Néel, BP 257, 38016 Grenoble Cedex 1, France;1. Laboratoire de Physique des Matériaux, Faculté des Sciences de Sfax, Université de Sfax, B.P. 1171, 3000 Sfax, Tunisia;2. Laboratoire de Physique des Matériaux et des Nanomatériaux appliquée à l''Environnement, Faculté des Sciences de Gabès, Université de Gabès, cité Erriadh, 6079 Gabès, Tunisia |
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| Abstract: | La0.7Ca0.3MnO3/Mn3O4 composites can be synthesized in one step by thermal treatment of a spray-dried precursor, instead of mixing pre-synthesized powders. Another advantage of this composite system is that a long sintering step can be used without leading to significant modification of the manganite composition. The percolation threshold is reached at ∼20 vol% of manganite phase. The 77 K low field magnetoresistance is enhanced to ∼11% at 0.15 T when the composition is close to the percolation threshold. |
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