Details

Autor(en) / Beteiligte

• Pearce, J.V
• Azuah, R.T
• Stirling, W.G
• Dimeo, R.M
• Sokol, P.E
• Adams, M.A

Titel

High-resolution measurements of the temperature dependence of the roton energy of superfluid [formula omitted]

Ist Teil von

• Physica. B, Condensed matter, 2000-03, Vol.276, p.822-823

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2000

Link zum Volltext

Quelle

Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)

Beschreibungen/Notizen

• Recent neutron inelastic scattering measurements at the ILL (energy resolution <1 μeV) of the dependence of the 4 He roton energy on temperature have shown significant deviations from the expected behaviour; the temperature variation was found to be slower than predicted by the established roton–roton interaction theory due to Bedell, Pines and Zawadowski (BPZ). New measurements of the roton excitations in superfluid 4 He have been made using the IRIS spectrometer (energy resolution ∼20 μeV) at the ISIS spallation neutron source. The roton energy was determined over a temperature range of 0.5–1.6 K. We find that our results can be described well by the BPZ theory over this temperature range.