Thermodynamic studies as a function of dilution in the Heisenberg antiferromagnetic Kagom\'e spin glass SrCr₉ₚ{Ga}_{12{{-}}9p}O₁₉ are presented. The unusual T² specific heat is found to be robust towards dilution, implying an origin intrinsic to the spin-glass state. The extremely small excitation stiffness and known correlation length indicate an unusual form of elementary excitation, with similarities to a hydrodynamic mode in a liquid.
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Ramirez et al. (1992) studied this question.
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