Observation of a superfluid component within solid helium
Lauter, H., Apaja, V., Kalinin, I., Kats, E., Koza, M., Krotscheck, E., Lauter, V.V., & Puchkov, A.V. (2011). Observation of a superfluid component within solid helium. Physical Review Letters, 107(26), 4. https://doi.org/10.1103/PhysRevLett.107.265301
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Physical Review LettersDate
2011Copyright
© 2011 American Physical Society. Published in this repository with the kind permission of the publisher.
We demonstrate by neutron scattering that a localized superfluid component exists at high pressures
within solid helium in aerogel. Its existence is deduced from the observation of two sharp phonon-roton
spectra which are clearly distinguishable from modes in bulk superfluid helium. These roton excitations
exhibit different roton gap parameters than the roton observed in the bulk fluid at freezing pressure. One of
the roton modes disappears after annealing the samples. Comparison with theoretical calculations
suggests that the model that reproduces the observed data best is that of superfluid double layers within
the solid and at the helium-substrate interface.
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American Physical SocietyISSN Search the Publication Forum
1079-7114Keywords
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http://link.aps.org/doi/10.1103/PhysRevLett.107.265301Publication in research information system
https://converis.jyu.fi/converis/portal/detail/Publication/21382816
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