Reference : Measurement of dielectric properties at low temperatures: application to the study of...
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Measurement of dielectric properties at low temperatures: application to the study of magnetoresistive manganite/ insulating oxide bulk composites
Vanderbemden, Philippe [Université de Liège - ULiège > 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 - ULiège > Département de chimie (sciences) > Chimie inorganique structurale >]
Journal of Physics: Conference Series
Institute of Physics
Yes (verified by ORBi)
International School on Condensed Matter Physics
August 29—September 3, 2010
[en] dielectric measurements ; composites ; magnetic properties
[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).
Services Universitaires Pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - SUPRATECS
Communauté française de Belgique - CfB ; Wallonie Bruxelles International - WBI ; Bulgarian Academy of Sciences - BAS
Researchers ; Professionals

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