Demonstrates metamagnetic transitions in Ba2LnFeO5 oxides, implying novel magnetic properties.
We report on the metamagnetic transition observed in oxides Ba₂LnFeO₅ (Ln = Tb, Dy, Ho, Er, Yb), which contain two magnetic sublattices: Fe³⁺ and Ln³⁺. The magnetic ordering in these materials results from a competition between several types of interaction (Fe-Fe, Fe-Ln, and Ln-Ln), combined in most cases with a strong easy-axis anisotropy of the Ln³⁺ magnetic moments induced by the crystal electric field (CEF). A specific mechanism is proposed to account for the peculiar metamagnetism in this class of materials, and its variation along the Ln series. This study is based on a set of results including magnetization, x-ray magnetic circular dichroism, neutron powder diffraction, and calculations of the CEF.
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Hardy et al. (2026) studied this question.
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