Unbundling the magnetic interactions in 3d/4f oxides: application to Ba2LnFeO5 compounds
Abstract
We present a practical route to disentangle the competing magnetic couplings in mixed 3d/4f oxides. The approach relies on a mean-field treatment of magnetic data, applied to two reference compounds measured alongside the target material: one in which the 4f magnetic ion is replaced by non-magnetic yttrium (Ln 3+ → Y 3+ ), and another in which the 3d magnetic ion is replaced by a non-magnetic cation of the same row and valence (Fe 3+ → Ga 3+ in the present case). We apply this strategy to two members of the Ba₂LnFeO₅ family (Ln=Dy,Ho), which has an original structure made of zig-zag LnO 6 octahedra separated by isolated FeO 4 tetrahedra. In these compounds the 3d-3d , 4f-4f , and 3d-4f exchanges are expected to lie on comparable energy scales, making them difficult to separate. The extracted coupling constants are compared with literature values and placed in a broader energetic hierarchy by assessing them against anisotropy and dipolar interactions.
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BibTeX
@article{hardy2026unbundling,
title = {{Unbundling the magnetic interactions in 3d/4f oxides: application to Ba2LnFeO5 compounds}},
author = {V. Hardy and V. Caignaert and F. Veillon and S. Collin and Y. Bréard and B. Gonano},
journal = {Journal of Magnetism and Magnetic Materials},
year = {2026},
month = oct,
doi = {10.1016/j.jmmm.2026.174507},
url = {https://hal.science/hal-05799693v1},
note = {CC BY},
}
RIS
TY - JOUR
TI - Unbundling the magnetic interactions in 3d/4f oxides: application to Ba2LnFeO5 compounds
AU - V. Hardy
AU - V. Caignaert
AU - F. Veillon
AU - S. Collin
AU - Y. Bréard
AU - B. Gonano
PY - 2026
DA - 2026/10/14
JO - Journal of Magnetism and Magnetic Materials
DO - 10.1016/j.jmmm.2026.174507
UR - https://hal.science/hal-05799693v1
AB - We present a practical route to disentangle the competing magnetic couplings in mixed 3d/4f oxides. The approach relies on a mean-field treatment of magnetic data, applied to two reference compounds measured alongside the target material: one in which the 4f magnetic ion is replaced by non-magnetic yttrium (Ln 3+ → Y 3+ ), and another in which the 3d magnetic ion is replaced by a non-magnetic cation of the same row and valence (Fe 3+ → Ga 3+ in the present case). We apply this strategy to two members of the Ba₂LnFeO₅ family (Ln=Dy,Ho), which has an original structure made of zig-zag LnO 6 octahedra separated by isolated FeO 4 tetrahedra. In these compounds the 3d-3d , 4f-4f , and 3d-4f exchanges are expected to lie on comparable energy scales, making them difficult to separate. The extracted coupling constants are compared with literature values and placed in a broader energetic hierarchy by assessing them against anisotropy and dipolar interactions.
SN - 0304-8853
SN - 1873-4766
ER -