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

doi:10.1103/PhysRevLett.79.5274

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 journal › Article › peer-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 T_c=1.9K. Below T_cthe roton energy is found to be weakly temperature dependent while above T_cit varies more rapidly than the bulk. A simple qualitative model for this behavior in terms of a confined length scale is discussed.

Original language	English (US)
Pages (from-to)	5274-5277
Number of pages	4
Journal	Physical review letters
Volume	79
Issue number	26
DOIs	https://doi.org/10.1103/PhysRevLett.79.5274
State	Published - Jan 1 1997

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1103/PhysRevLett.79.5274

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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.",

author = "Dimeo, {R. M.} and Sokol, {P. E.} and Brown, {D. W.} and Anderson, {C. R.} and Stirling, {W. G.} and Adams, {M. A.} and Lee, {S. H.} and C. Rutiser and S. Komarneni",

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T1 - Effects of disorder on the collective excitations in helium

AU - Dimeo, R. M.

AU - Sokol, P. E.

AU - Brown, D. W.

AU - Anderson, C. R.

AU - Stirling, W. G.

AU - Adams, M. A.

AU - Lee, S. H.

AU - Rutiser, C.

AU - Komarneni, S.

PY - 1997/1/1

Y1 - 1997/1/1

N2 - 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.

AB - 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.

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U2 - 10.1103/PhysRevLett.79.5274

DO - 10.1103/PhysRevLett.79.5274

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JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

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