Metamagnetic behaviour of La1 − xGdxFe12B6 compounds

Possible role of two iron sites in the metamagnetic transition observed in LaFe12 B6

“…However, similarity of calculated total magnetic moments ( Table 2) with the experimental ones imply that minima found by calculations correctly correspond to the observed LM and HM states [6]. Calculated moment for the LM state much better agrees with the experimental value than that calculated for the HM state.…”

“…The FSM calculations enabled finding two minima which correspond to the observed magnetic states in LaFe 12 B 6 [6]. However, their relative stability for lattice constants used in present calculations is in disagreement with experimental findings.…”

“…at an applied magnetic field of about 8.6 T. In addition, replacement of La atom by magnetic rare earth atom drastically enhances magnetic moments of the Fe 3d-sublattice. This indicates that LM state initially found in the Fe 3d-sublattice is close to the instability for formation of the HM state [6,7]. * Corresponding author.…”

“…According to the experimental data given by Li et al [6] the compound LaFe 12 B 6 (space group R3m; structure type SrNi 12 B 6 ) which was regarded as initially antiferromagnetic [6,7] exhibits metamagnetic transition from the LM state (4.6μ B /f.u.) to the HM state (20.0μ B /f.u.)…”

“…B6 indicate that LM state is essentially formed by the Fe(18(g)) sublattice.Results of FSM calculations for the model compound LaCu B 6 are shown inFig. 5.…”