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Accueil du site > Vie du Laboratoire > Archives > Archives 2015 "Actualités" >

9 janvier 2017

Interplay between 3d-3d and 3d-4f interactions at the origin of the magnetic ordering in the Ba2LnFeO5 oxides

The perovskite derivatives of formulation Ba2LnFeO5 (Ln = Sm, Eu, Gd, Dy, Ho, Er, Yb, as well as Y) exhibit a peculiar structure in which isolated FeO4 tetrahedra are linked by LnO6 octahedra. As a result, the strong super-exchange (SE) Fe-O-Fe coupling usually observed in LnFeO3 perovskites is absent, and one is left in a situation where only a weaker super-super exchange (SSE) Fe-O-O-Fe mechanism competes with SE Fe-O-Ln. This Ba2LnFeO5 series offers a rare opportunity to investigate experimentally a situation where the 3d-3d and 3d-4f interactions co-operate on an equal footing to trigger a unique long-range magnetic ordering in insulating oxides.

A. K Kundu, V. Hardy, V. Caignaert, B. Raveau

J. Phys.:Condens. Matter 27, 486001 (2015)

Collaboration PSOM & NMF2

Physique et Structures d’Oxydes Magnétiques (PSOM)

Nouveaux Matériaux : Fondements, Fonctionnalités (NMF2)