ORBi: Vanderbemden Philippe - Measurement of dielectric properties at low temperatures: application to the study of magnetoresistive manganite/ insulating oxide bulk composites

Reference : Measurement of dielectric properties at low temperatures: application to the study of ma...


	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/2268/72718

Title :	Measurement of dielectric properties at low temperatures: application to the study of magnetoresistive manganite/ insulating oxide bulk composites
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 >]
	Rivas-Murias, Beatriz [University of Santiago de Compostela, Spain > Departamento de Quimica-Fisica > > >]
	Lovchinov, Vassil [Bulgarian Academy of Science - BAS > > > >]
	Vertruyen, Bénédicte [Université de Liège - ULg > Département de chimie (sciences) > Chimie inorganique structurale >]
Publication date :	2010
Journal title :	Journal of Physics: Conference Series [=JPCS]
Publisher :	Institute of Physics
Volume :	253
Pages :	012006
On invitation :	Yes
Audience :	International
ISSN :	1742-6588
e-ISSN :	1742-6596
City :	Bristol
Country :	UK
Event name :	International School on Condensed Matter Physics
Event date :	August 29—September 3, 2010
Event place (city) :	Varna
Event country :	Bulgaria
Keywords :	[en] dielectric measurements ; composites ; magnetic properties
Abstract :	[en] In this paper, we report low temperature dielectric measurements of bulk composite electroceramic samples containing a colossal magnetoresistive (CMR) manganite phase (La0.7Ca0.3MnO3 [abbreviated LCMO]) and an insulating phase (Mn3O4). Details of the experimental system are given and possible experimental artefacts due to moisture are outlined. For a LCMO volume fraction of ~ 16%, the permittivity of the LCMO/ Mn3O4 composite at T = 50 K is found to be much higher than that of pure Mn3O4 and magnetic field dependent. This effect is related to an extrinsic space charge polarization mechanism between the insulating phase (Mn3O4) and the conducting magnetoresistive phase (LCMO).
Research units :	Services Universitaires Pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - SUPRATECS
Funders :	Communauté française de Belgique - CfB ; Wallonie Bruxelles International - WBI ; Bulgarian Academy of Sciences - BAS
Target :	Researchers ; Professionals
Permalink :	http://hdl.handle.net/2268/72718
DOI :	10.1088/1742-6596/253/1/012006
Other URL :	http://iopscience.iop.org/1742-6596/253/1/012006/

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Open access	Vanderbemden_L14_Varna2010_final_version.pdf		Author postprint	77.23 kB	View/Open
Restricted access	jpconf253_012006_editor_postprint.pdf		Publisher postprint	181.54 kB	Request copy

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