Bose-Einstein Condensation, Superflow and Excitations of Liquid 4He Confined in nanoporous FSM-28
We propose neutron scattering measurements of the phonon-roton (P-R) and layer modes of liquid 4He confined in the nanoporous media FSM-28 on IN5. The superfluid density, superfluid critical temperature, TC, and the specific heat of liquid 4He in FSM-28 have recently been accurately measured. The aim is to explain these measurements in terms of the characteristic modes. We will use the same FSM-28 so that direct comparison of results can be made. The TC in FSM-28 is very low, far below TC in bulk liquid 4He. A specific goal is to determine the onset temperature for BEC, TBEC, from the temperature dependence of the P-R modes, to see whether TBEC lies above TC and whether there is a temperature range TC < T < TBEC in which there is BEC but no superflow in FSM-28. This region would be similar to the pseudo gap phase TC < T < T* observed in the cuprate superconductors where there is a localized gap and local pairing but no superconductivity. A second goal is to investigate which modes give rise to the specific heat, the P-R or the layer modes.
Please note that you will need to login with your ILL credentials to download the data.
Download DataThe recommended format for citing this dataset in a research publication is in the following format:
BOSSY Jacques; GLYDE Henry; OLLIVIER Jacques and SPATHIS Panayotis. (2013). Bose-Einstein Condensation, Superflow and Excitations of Liquid 4He Confined in nanoporous FSM-28. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-01-325
ILL has partnered with DataCite as the registration agency
for data persistent identifiers.