Abstract
${\text{SrSn}}_{2}{\text{Ga}}_{1.3}{\text{Cr}}_{2.7}{\text{O}}_{11}$ is shown to be a strongly geometrically frustrated magnet through measurement of its temperature-dependent magnetic susceptibility and specific heat. This material, determined by powder neutron diffraction to have an $R$-type ferrite crystal structure, has $S=3/2$ ${\text{Cr}}^{3+}$ ions in isolated Kagom\'e planes with no magnetic ions in the intermediary structural layers. The Kagom\'e planes contain 10% nonmagnetic ${\text{Ga}}^{3+}$. This structure type makes the chromate family of frustrated magnets unusual because it displays four spinel-based structural variants with the same basic magnetic lattice and different effective dimensionalities and degrees of frustration. A comparison of the structures and magnetic characteristics is presented.
Published Version
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