Confinement Effects on Superfluid Helium

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Inelastic neutron scattering has been used to probe the collective excitations of superfluid helium confined to silica aerogel. Confinement in porous aerogel results in a crossover behavior in the temperature dependence of the roton where the energy is relatively temperature independent below 1.9 K and strongly temperature dependent above 1.9 K. As in the bulk liquid, the relationship between the microscopic excitation spectrum and the macroscopic thermodynamics of the confined system are found to be in good agreement.

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