Reference : Grain boundary effects in bulk colossal magneto resistive (CMR) manganites and mangan...
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Grain boundary effects in bulk colossal magneto resistive (CMR) manganites and manganite/insulator composites: electrical and magnetic properties
Vanderbemden, Philippe mailto [Université de Liège - ULiège > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques >]
Vertruyen, Bénédicte [Université de Liège - ULiège > Département de chimie (sciences) > Chimie inorganique structurale >]
Ausloos, Marcel [Université de Liège - ULiège > Département de physique > Département de physique >]
Rivas-Murias, Beatriz [Université de Liège - ULiège > Département de Chimie > > >]
Lovchinov, Vassil [Bulgarian Academy of Science - BAS > > > >]
Journal of Optoelectronics and Advanced Materials [= JOAM]
International School on Condensed Matter Physics
September 2008
[en] grain boundaries ; cmr materials ; electrical resistivity
[en] In the first part of this paper, we discuss the effects of grain boundaries on the properties of bulk colossal magnetoresistive (CMR) manganites We compare the electrical resistivity and AC magnetic susceptibility of perovskite La-Ca-Mn-O samples with the same nominal stoichiometry but differing in their microstructure (i) a single grain sample, (ii) a sample containing two grains and (iii) a polycrystalline sample Emphasis is placed on information that can be deduced from the measurements in each case In the second part of the paper, we report the data measured on composite samples containing a CMR phase (La-Ca-Mn-O) and an insulating phase (Mn3O4) The results are discussed in the framework of percolation theory We show how the grain boundaries affect the electrical properties of these materials, and we highlight the crucial role of geometric (demagnetization) effects on the resistance vs magnetic field measurements
Services Universitaires Pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - SUPRATECS
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Communauté française de Belgique - CfB ; CGRI ; Union Européenne = European Union - UE = EU
Researchers ; Professionals

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