Bose-Einstein Condensate in Solid Helium

Details Bose-Einstein Condensate in Solid Helium Bose-Einstein Condensate in Solid Helium

2007-02-14

arxiv.org/abs/cond-mat/0702347v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 5 figures (in press)

Scientific paper

10.1103/PhysRevLett.98.205301

We present neutron scattering measurements of the atomic momentum distribution, n(k), in solid helium under a pressure p = 41 bars and at temperatures between 80 mK and 500 mK. The aim is to determine whether there is Bose-Einstein condensation (BEC) below the critical temperature, T_c = 200 mK where a superfluid density has been observed. Assuming BEC appears as a macroscopic occupation of the k = 0 state below T_c, we find a condensate fraction of n_0 = (-0.10 \pm 1.20)% at T = 80 mK and n_0 = (0.08\pm0.78)% at T = 120 mK, consistent with zero. The shape of n(k) also does not change on crossing T_c within measurement precision.

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