We measured the low-temperature ac magnetic susceptibilities ( χ^', χ^'', and χ₃), static magnetization, and the specific heat of a high-quality single crystal of gadolinium gallium garnet (GGG), which is a geometrically frustrated Heisenberg magnet. We find a spin glass transition at low temperatures, in addition to unusual behavior in χ^'' and χ₃. Comparison to nonmagnetic isomorphs and the low levels of structural and chemical disorder in GGG suggests that the transition is due to the highly frustrated geometry of the magnetic lattice.
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Schiffer et al. (1995) studied this question.
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