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

Vanderbemden, Philippe; Vertruyen, Bénédicte; Ausloos, Marcel; Rivas-Murias, Beatriz; Lovchinov, Vassil

Paper published in a journal (Scientific congresses and symposiums)

Vanderbemden, Philippe; Vertruyen, Bénédicte; Ausloos, Marcel et al.

2009 • In 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/Unit :

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 :

Issue :

Pages :

1115-1121

Peer reviewed :

Peer reviewed

Additional URL :

http://inoe.inoe.ro/joam/index.php?option=magazine&op=view&idu=2035&catid=42

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique
FWB - Fédération Wallonie-Bruxelles
CGRI - Commissariat général aux Relations internationales
UE - Union Européenne

Available on ORBi :

since 07 January 2010

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