ORBi: Vanderbemden Philippe - Grain boundary effects in bulk colossal magneto resistive (CMR) manganites and manganite/insulator composites: electrical and magnetic properties

Reference : Grain boundary effects in bulk colossal magneto resistive (CMR) manganites and manganite...


	Document type :	Scientific congresses and symposiums : Paper published in a journal
	Discipline(s) :	Engineering, computing & technology : Electrical & electronics engineering Physical, chemical, mathematical & earth Sciences : Physics
	To cite this reference:	http://hdl.handle.net/2268/34878

Title :	Grain boundary effects in bulk colossal magneto resistive (CMR) manganites and manganite/insulator composites: electrical and magnetic properties
Language :	English
Author, co-author :	Vanderbemden, Philippe [Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Capteurs et systèmes de mesures électriques >]
	Vertruyen, Bénédicte [Université de Liège - ULg > Département de chimie (sciences) > Chimie inorganique structurale >]
	Ausloos, Marcel [Université de Liège - ULg > Département de physique > Département de physique >]
	Rivas-Murias, Beatriz [Université de Liège - ULG > Département de Chimie > > >]
	Lovchinov, Vassil [Bulgarian Academy of Science - BAS > > > >]
Publication date :	2009
Journal title :	Journal of Optoelectronics and Advanced Materials [= JOAM]
Volume :	11
Issue/season :	9
Pages :	1115-1121
Peer reviewed :	Yes
On invitation :	Yes
Audience :	International
ISSN :	1454-4164
Event name :	International School on Condensed Matter Physics
Event date :	September 2008
Event place (city) :	Varna
Event country :	Bulgaria
Keywords :	[en] grain boundaries ; cmr materials ; electrical resistivity
Abstract :	[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
Research units :	Services Universitaires Pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - SUPRATECS
Funders :	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
Target :	Researchers ; Professionals
Permalink :	http://hdl.handle.net/2268/34878
Other URL :	http://inoe.inoe.ro/joam/index.php?option=magazine&op=view&idu=2035&catid=42

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