Abstract
A new anomaly in the acoustic properties of solid 4He has been observed when as little as a few parts per million of 3He impurities are added. We show that the specific properties of the anomaly can be explained by a continuous (second order) phase transition from a condensed state above a critical temperature to a normal state below it. In this model the Bose particles which condense are long lived, thermally activated excitations.
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Ho, PC., Bindloss, I.P. & Goodkind, J.M. A New Anomaly in Solid 4He. J Low Temp Phys 109, 409–421 (1997). https://doi.org/10.1007/s10909-005-0094-0
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DOI: https://doi.org/10.1007/s10909-005-0094-0