Phys. Rev. Lett. 98, 205301 (2007) [4 pages]Bose-Einstein Condensation in Solid 4HeReceived 14 February 2007; published 17 May 2007 We present neutron scattering measurements of the atomic momentum distribution n(k) in solid helium under a pressure p=41 bar (molar volume Vm=20.01±0.02 cm3/mol) and at temperatures between 80 and 500 mK. The aim is to determine whether there is Bose-Einstein condensation (BEC) below the critical temperature, Tc=200 mK, where a superfluid density has been observed. Assuming BEC appears as a macroscopic occupation of the k=0 state below Tc, we find a condensate fraction of n0=(-0.10±1.20)% at T=80 mK and n0=(0.08±0.78)% at T=120 mK, consistent with zero. The shape of n(k) also does not change on crossing Tc within measurement precision. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.205301
DOI:
10.1103/PhysRevLett.98.205301
PACS:
67.80.−s, 61.12.Ex, 67.90.+z
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