Abstract
We present the first low frequency (0.1--50 Hz) measurements of the complex elastic constant on ${\mathrm{C}}_{60}$ single crystals. We have measured a negative dip anomaly of 25% at ${\mathit{T}}_{\mathrm{I}}$=261 K, which did not show up in previous elastic studies at ${10}^{4}$ Hz. The slow relaxation observed near ${\mathit{T}}_{\mathrm{I}}$ is supposed to be due to the very slow dynamics of the order parameter fluctuations. In addition it is shown that the elastic anomalies observed at ${10}^{4}$ Hz and 160 K originate from the same physical process as the ``glass'' transition at 80 K observed in thermal expansivity.
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