Magnetic behavior and coupling of the Tb and Fe sublattices

Determine the magnetic behavior of the terbium and iron sublattices in monoclinic TbFe₂D₄.₂ and establish how the two sublattices are correlated.

Background

Earlier work on TbFe₂D₄.₂ identified a cell-volume contraction near 160 K, but the magnetization curves showed a continuous decrease characteristic of ferrimagnetic behavior. The authors state that the prior experimental results had not been fully analyzed, leaving unresolved the separate temperature- and field-dependent behavior of the Tb and Fe magnetic sublattices and the nature of their coupling.

The present study addresses this issue using complementary low- and high-field magnetometry together with neutron diffraction as a function of temperature and applied magnetic field. The subsequent analysis proposes a ferrimagnetic structure and identifies distinct thermal changes in the Tb and Fe moments, but the explicitly stated unresolved problem is the determination of their individual magnetic behavior and correlation.

References

But in this previous work the experimental results were not fully analyzed, and some questions remained unsolved such as the magnetic behavior of each Tb and Fe sublattices and how they are correlated.

— Determination of the ferrimagnetic structure of monoclinic TbFe$_{2}$D$_{4.2}$ deuteride and its evolution versus temperature and high magnetic field  (2608.23346 - Paul-Boncour et al., 24 Aug 2026) in Section 1, Introduction