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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/55975
Record Status
Checked
Record Id
55975
Title
Bose-Einstein condensation in liquid 4He under pressure
Contributors
HR Glyde (Delaware U.)
,
SO Diallo (ORNL)
,
RT Azuah (Maryland U.)
,
O Kirichek (STFC Rutherford Appleton Lab.)
,
JW Taylor (STFC Rutherford Appleton Lab.)
Abstract
We present neutron-scattering measurements of Bose-Einstein condensation, the atomic momentum distribution, and final-state effects in liquid 4He under pressure. The condensate fraction at low temperature is found to decrease from n0 = 7.25 ± 0.75% at saturated vapor pressure (p ~ 0) to n0 = 3.2 ± 0.75% at pressure p = 24 bar. This indicates an n0 = 3.0% in the liquid at the liquid/solid coexistence line (p = 25.3 bar). The atomic momentum distribution n(k) has high occupation of low-k states and differs significantly from a Gaussian [e.g., a classical n(k)]. Both n(k) and the final-state function broaden with increasing pressure, reflecting the increased localization of the 4He in space under increased pressure.
Organisation
ISIS
,
ISIS-MARI
,
STFC
Keywords
RALSpace 2011-2012
,
Bose-Einstein condensation
,
Physics
,
pressure
,
liquid helium
Funding Information
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Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
Phys Rev B
83 (2011): 100507R.
doi:10.1103/PhysRevB.83.100507
2011
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