Observation of a superfluid component within solid helium
Lauter, H., Apaja, V., Kalinin, I., Kats, E., Koza, M., Krotscheck, E., . . . , & Puchkov, A. V. (2011). Observation of a superfluid component within solid helium. Physical Review Letters, 107 (26), 4. doi:10.1103/PhysRevLett.107.265301
Published inPhysical Review Letters
Kats, E. |
Koza, M. |
© 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.
PublisherAmerican Physical Society
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