Bose-Einstein Condensation in liquid $^4$He near the liquid-solid transition line
Abstract
We present precision neutron scattering measurements of the Bose-Einstein condensate fraction, n0(T), and the atomic momentum distribution, n\star(k), of liquid 4He at pressure p =24 bar. Both the temperature dependence of n0(T) and of the width of n\star(k) are determined. The n0(T) can be represented by n0(T) = n0(0)[1-(T/T{\lambda}){\gamma}] with a small n0(0) = 2.80\pm0.20% and large {\gamma} = 13\pm2 for T < T{\lambda} indicating strong interaction. The onset of BEC is accompanied by a significant narrowing of the n\star(k). The narrowing accounts for 65% of the drop in kinetic energy below T{\lambda} and reveals an important coupling between BEC and k > 0 states. The experimental results are well reproduced by Path Integral Monte Carlo calculations.
Cite
@article{arxiv.1111.2284,
title = {Bose-Einstein Condensation in liquid $^4$He near the liquid-solid transition line},
author = {S. O. Diallo and R. T. Azuah and D. L. Abernathy and R. Rota and J. Boronat and H. R. Glyde},
journal= {arXiv preprint arXiv:1111.2284},
year = {2015}
}
Comments
4 Pages, 5 Figures