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 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
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
Language :
English
Title :
Measurement of dielectric properties at low temperatures: application to the study of magnetoresistive manganite/ insulating oxide bulk composites
