Effects of disorder on the collective excitations in helium

R. M. Dimeo, P. E. Sokol, D. W. Brown, C. R. Anderson, W. G. Stirling, M. A. Adams, S. H. Lee, C. Rutiser, S. Komarneni

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

We present inelastic neutron scattering measurements of the roton excitation of superfluid helium confined in two different porosity aerogels. The temperature dependence of the roton energy exhibits an anomalous crossover behavior at Tc=1.9K. Below Tcthe roton energy is found to be weakly temperature dependent while above Tcit varies more rapidly than the bulk. A simple qualitative model for this behavior in terms of a confined length scale is discussed.

Original languageEnglish (US)
Pages (from-to)5274-5277
Number of pages4
JournalPhysical review letters
Volume79
Issue number26
DOIs
StatePublished - Jan 1 1997

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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