Nonclassical Rotational Inertia in Single Crystal Helium
A. C. Clark, J. T. West, and M. H. W. Chan
TL;DR
This study investigates the origin of nonclassical rotational inertia in solid helium, providing evidence that it is not caused by superfluid films along grain boundaries, challenging previous hypotheses.
Contribution
The paper presents new torsional oscillator measurements on large helium crystals, showing NCRI occurs independently of grain boundary superfluidity, suggesting a different underlying mechanism.
Findings
NCRI observed in all samples
Superfluid film hypothesis challenged
Grain boundary superfluidity unlikely cause
Abstract
It has been proposed that the observed nonclassical rotational inertia (NCRI) in solid helium results from the superflow of thin liquid films along interconnected grain boundaries within the sample. We have carried out new torsional oscillator measurements on large helium crystals grown under constant temperature and pressure. We observe NCRI in all samples, indicating that the phenomenon cannot be explained by a superfluid film flowing along grain boundaries.
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