Abstract
We present results of the search for supersolid 4He using low-frequency, low-level mechanical excitation of a solid sample grown and cooled at fixed volume. We have observed low frequency non-linear resonances that constitute anomalous features. These features, which appear below ∼0.8 K, are absent in 3He. The frequency, the amplitude at which the nonlinearity sets in, and the upper temperature limit of existence of these resonances depend markedly on the sample history.
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Mukharsky, Y., Avenel, O. & Varoquaux, E. Search for Supersolidity in 4He in Low-Frequency Sound Experiments. J Low Temp Phys 148, 689–693 (2007). https://doi.org/10.1007/s10909-007-9454-2
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DOI: https://doi.org/10.1007/s10909-007-9454-2