Jump to main content
Jump to site search

Issue 29, 2017
Previous Article Next Article

Superexchange interactions between Fe-3d and Ln-4f states: long range antiferromagnetism in perovskite derivatives Ba3LnFe2O7.5

Author affiliations

Abstract

Perovskite derivatives Ba3LnFe2O7.5, with Ln = Sm, Eu, Gd, Dy, Ho, Er have been synthesized. These oxides isotypic to the already known yttrium phase crystallize in the P21/c space group. Their structure can be described as an assemblage of double “FeLn” chains built up of isolated FeO4 tetrahedrons and YO6 octahedrons, interconnected through dimeric tetrahedral Fe2O7 groups. Magnetization and specific heat measurements show that all the members of this series, including the Y-phase, exhibit long range antiferromagnetic ordering, with TN ranging from 6.2 K for Y to 12.5 K for Dy. The evolution of TN with respect to the rare earth size is complex and similar to that observed for the structurally related Ba2LnFeO5 perovskites, but shows significantly higher values. The antiferromagnetism of the Y-phases is ascribed to SSE Fe–O–O–Fe interactions along the chains in both oxides “Ba3Y” and “Ba2Y”, whereas in addition transversal SSE/SE Fe–O–O–Fe–O–Fe–O–O–Fe interactions between the chains are proposed for the “Ba3Y” phase. For magnetic lanthanides, the antiferromagnetic behavior of both series implies strong 3d(Fe)–4f(Ln) interactions, i.e. SE Ln–O–Fe interactions along the chains in both series but in addition transversal SE Ln–O–Fe–O–Fe–O–Ln interactions between the chains in the “Ba3Y” series. The particular role of the magnetic moment and magnetic anisotropy of the lanthanide is also considered.

Graphical abstract: Superexchange interactions between Fe-3d and Ln-4f states: long range antiferromagnetism in perovskite derivatives Ba3LnFe2O7.5

Back to tab navigation

Supplementary files

Publication details

The article was received on 19 Apr 2017, accepted on 02 Jul 2017 and first published on 05 Jul 2017


Article type: Paper
DOI: 10.1039/C7TC01710C
Citation: J. Mater. Chem. C, 2017,5, 7236-7242
  •   Request permissions

    Superexchange interactions between Fe-3d and Ln-4f states: long range antiferromagnetism in perovskite derivatives Ba3LnFe2O7.5

    A. K. Kundu, V. Caignaert, V. Hardy and B. Raveau, J. Mater. Chem. C, 2017, 5, 7236
    DOI: 10.1039/C7TC01710C

Search articles by author

Spotlight

Advertisements