ac magnetic behavior of large-grain magnetoresistive La0.78Ca0.22Mn0.90Ox materials

[en] We report a detailed set of ac magnetic measurements carried out on bulk large grain La-Ca-Mn-O samples extracted from a floating zone method-grown rod. Three samples with La0.78Ca0.22Mn0.90Ox stoichiometry but differing in their microstructure were investigated by electrical resistivity and ac susceptibility measurements: (i) a single grain sample, (ii) a sample containing two grains, and (iii) a polycrystalline sample. We show that the superimposition of dc magnetic fields during ac magnetic susceptibility measurements is an efficient way for characterizing the magnetic transition of samples with different microstructures. Whereas both single grain and polycrystalline samples display a single susceptibility peak, an additional kink structure is observed in the case of the double grain sample. The temperature dependence of the ac susceptibility measured with superimposed dc magnetic fields is analyzed in the framework of second-order phase transition ideas. The relations between the critical exponents (beta+gamma ~ 1.5, delta ~ 2.5) are found to be close to those of the mean-field model for all samples. This is attributed to the disordering caused by unoccupied Mn sites. ©2003 The American Physical Society.

Research Center/Unit :

SUPRATECS - Services Universitaires pour la Recherche et les Applications Technologiques de Matériaux Électro-Céramiques, Composites, Supraconducteurs - ULiège

Disciplines :

Materials science & engineering
Physics

Author, co-author :

Vanderbemden, Philippe ; Université de Liège - ULiège > Capteurs et systèmes de mesures électriques

Vertruyen, Bénédicte ; Université de Liège - ULiège > Chimie inorganique structurale

Rulmont, André ; Université de Liège - ULiège > Chimie inorganique structurale

Cloots, Rudi ; Université de Liège - ULiège > Chimie inorganique structurale

Dhalenne, Guy

Ausloos, Marcel ; Université de Liège - ULiège > Département de physique > Physique statistique appliquée et des matériaux

Language :

English

Title :

ac magnetic behavior of large-grain magnetoresistive La0.78Ca0.22Mn0.90Ox materials

Publication date :

December 2003

Journal title :

Physical Review. B, Condensed Matter and Materials Physics

ISSN :

1098-0121

eISSN :

1550-235X

Publisher :

American Physical Society, College Pk, United States - Maryland

Volume :

Issue :

Pages :

224418

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://prola.aps.org/abstract/PRB/v68/i22/e224418

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique

Available on ORBi :

since 02 December 2008

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