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Bose-Einstein condensation in liquid4He near the liquid-solid transition line
2012
Physical Review B
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We present precision neutron scattering measurements of the Bose-Einstein condensate fraction, n0(T), and the atomic momentum distribution, n(k), of liquid 4He at pressure p =24 bar. Both the temperature dependence of n0(T) and of the width of n(k) are determined. The n0(T) can be represented by n0(T) = n0(0)[1-(T/Tλ)γ] with a small n0(0) = 2.80±0.20 γ = 13±2 for T < Tλ indicating strong interaction. The onset of BEC is accompanied by a significant narrowing of the n(k). The narrowing accounts
doi:10.1103/physrevb.85.140505
fatcat:zeiphcftmjbrtd73ypomn64jsq