6533b82afe1ef96bd128c1bd
RESEARCH PRODUCT
Observation of a superfluid component within solid helium.
E. I. KatsV. ApajaHans J. LauterA. V. PuchkovEckhard KrotscheckEckhard KrotscheckMichael Marek KozaValeria LauterIvan Kalininsubject
Condensed Matter::Quantum GasesPhysicsCondensed matter physicsCondensed Matter::OtherAnnealing (metallurgy)General Physics and Astronomychemistry.chemical_elementAerogelNeutron scatteringCondensed Matter::Mesoscopic Systems and Quantum Hall EffectRotonSpectral lineSuperfluiditychemistrySuperfluid helium-4Heliumdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-12-22 | Physical review letters |