Magnetic ordering in the spinel compound $Li[Mn2−xLix]O4(x=,0.04)$ Available to Purchase

The two $B$-site ions $Mn3+$ and $Mn4+$ in the stoichiometric spinel structure $LiMn2O4$ form a complex, columnar ordered pattern below the charge-ordering transition at room temperature. On further cooling to below 66 K, the system develops long-range antiferromagnetic order. In contrast, whereas lithium-substituted $Li[Mn2−xLix]O4$ also undergoes a charge-ordering transition around room temperature, it only displays frozen in short-range magnetic order below $∼25–30K$⁠. We investigate to what extent the columnar charge-order pattern observed in $LiMn2O4$ can account for the measured magnetic ordering patterns in both the pure and Li-substituted $(x=0.04)$ compounds. We conclude that eightfold rings of $Mn4+$ ions form the main magnetic unit in both compounds $(x=0,0.04)$⁠, and that clusters formed out of these rings act as superspins in the doped compound.