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Bose-Einstein Condensation in SolidHe4
2007
Physical Review Letters
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
doi:10.1103/physrevlett.98.205301
pmid:17677706
fatcat:ivuw3tkx7bfulkx5poecbhqrny