6533b831fe1ef96bd1299250
RESEARCH PRODUCT
Observation of a superfluid component within solid helium
Hans LauterVesa ApajaI. KalininE. KatsM. KozaE. KrotscheckV.v. LauterA.v. Puchkovsubject
Condensed Matter::Quantum Gasessupersolid 4HeCondensed Matter::OtherRestricted geometriesRajatut geometriatsupranestnosyys 4He kiteessäCondensed Matter::Mesoscopic Systems and Quantum Hall Effectsuprakide 4HeSuperfluidity in solid 4Hedescription
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. peerReviewed
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-01-01 |