Two-Dimensional Short-Range Magnetic Order in the Tetragonal Spinel Li2Mn2O4
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Abstract
Metastable, tetragonal Li2Mn2O4, prepared by chemical insertion of Li into the cubic spinel, LiMn2O4, was studied by dc magnetic susceptibility and neutron diffraction. The susceptibility data show a very broad maximum at about 120 K, a sharp maximum at about 50 K, and no evidence for Curie−Weiss behavior even up to 600 K. This is consistent with the dominance of short-range, antiferromagnetic correlations attributed to the geometrical frustration inherent in the Mn3+ sublattice which is a slightly distorted pyrochlore lattice, a three-dimensional array of corner-sharing tetrahedra. The temperature dependence of two diffuse peaks in the neutron diffraction data correlate well with the 50 K anomaly but show, remarkably, an asymmetric Warren line-shape characteristic of two-dimensional correlations with no sign of long-range order down to 1.6 K. The magnetic reflections can be indexed as (2 0) and (1 3) of a √3 × √3 magnetic structure arising from a Kagomé layer. The structure and properties of tetragonal Li2Mn2O4 are compared with the thermodynamically stable orthorhombic form.
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