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Grain boundary effects in bulk colossal magneto resistive (CMR) manganites and manganite/insulator composites: electrical and magnetic properties
Vanderbemden, Philippe; Vertruyen, Bénédicte; Ausloos, Marcel et al.
2009In Journal of Optoelectronics and Advanced Materials, 11 (9), p. 1115-1121
Peer reviewed
 

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Keywords :
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 center :
SUPRATECS - Services Universitaires pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - ULiège
Disciplines :
Physics
Electrical & electronics engineering
Author, co-author :
Vanderbemden, Philippe  ;  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
Language :
English
Title :
Grain boundary effects in bulk colossal magneto resistive (CMR) manganites and manganite/insulator composites: electrical and magnetic properties
Publication date :
2009
Event name :
International School on Condensed Matter Physics
Event place :
Varna, Bulgaria
Event date :
September 2008
By request :
Yes
Audience :
International
Journal title :
Journal of Optoelectronics and Advanced Materials
ISSN :
1454-4164
eISSN :
1841-7132
Publisher :
National Institute of Research and Development for Optoelectronics, Romania
Volume :
11
Issue :
9
Pages :
1115-1121
Peer reviewed :
Peer reviewed
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
FWB - Fédération Wallonie-Bruxelles [BE]
CGRI - Commissariat général aux Relations internationales [BE]
UE - Union Européenne [BE]
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