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Persistent URL http://purl.org/net/epubs/work/55975
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Record Id 55975
Title Bose-Einstein condensation in liquid 4He under pressure
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
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Language English (EN)
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Journal Article Phys Rev B 83 (2011): 100507R. doi:10.1103/PhysRevB.83.100507 2011