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Abstract: It has been proposed that the observed nonclassical rotational inertia NCRIin solid helium results from the superflow of thin liquid films alonginterconnected grain boundaries within the sample. We have carried out newtorsional oscillator measurements on large helium crystals grown under constanttemperature and pressure. We observe NCRI in all samples, indicating that thephenomenon cannot be explained by a superfluid film flowing along grainboundaries.



Author: A. C. Clark, J. T. West, M. H. W. Chan

Source: https://arxiv.org/



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