Nature of short-range order in the paramagnetic state of manganites

•The Curie–Weiss law is redefined in the studied temperature range.•This will lead to a homogeneous macroscopic electronic state picture.•It is in contrast with the coexistence of insulating and metallic regions. We study the nature of short-range magnetic interactions observed in the paramagnetic p...

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Veröffentlicht in:Journal of alloys and compounds 2013-09, Vol.571, p.21-24
Hauptverfasser: Ramirez, Fabian E.N., Francisquini, Elton, Souza, José Antonio
Format: Artikel
Sprache:eng
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Zusammenfassung:•The Curie–Weiss law is redefined in the studied temperature range.•This will lead to a homogeneous macroscopic electronic state picture.•It is in contrast with the coexistence of insulating and metallic regions. We study the nature of short-range magnetic interactions observed in the paramagnetic phase of colossal magnetoresistance compounds. Our results reveal that ferromagnetic-like interaction between Mn ions cannot be explained by the conventional double exchange mechanism. The results show evidence that the eg electrons are localized in Mn3+ ions regardless the introduction of holes leading to ferromagnetic/antiferromagnetic superexchange-like interactions.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2013.03.045