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Inelastic neutron experiments on the classical triangular-latticegeometrically frustrated antiferromagnet h-YMnO$_3$ reveal diffuse, gaplessmagnetic excitations present both below and far above the ordering temperature,$T_N$. The correlation length of the excitations increases as the temperatureapproaches zero, bearing strong resemblance to critical scattering. We modelthe scattering as critical spin-spin correlations in a two-dimensional magneticground state, and we speculate that this may provide a general framework tounderstand features typically attributed to classical spin liquids.

Classical spin liquid or extended critical range in h-YMnO$_3$?