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/Tλ)γ] with a small n0(0) = 2.80\pm0.20% and large γ = 13\pm2 for T < Tλ 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 Tλ and reveals an important coupling between BEC and k > 0 states. The experimental results are well reproduced by Path Integral Monte Carlo calculations.

4 Pages, 5 Figures

References in corpus (5)

• Bose-Einstein condensation of photons in an optical microcavity
• Bose-Einstein Condensation in Magnetic Insulators
• Bose-Einstein Condensate in Solid Helium
• Interplay of Rotational, Relaxational, and Shear Dynamics in Solid 4He
• Path Integral Monte Carlo calculation of momentum distribution in solid \^4\He

Cited by in corpus (8)

• Thermal instability, evaporation and thermodynamics of one-dimensional liquids in weakly-interacting Bose-Bose mixtures
• Theory of cold atoms: Bose-Einstein statistics
• Ground state of a homogeneous Bose gas of hard spheres
• Weak Measurement and Two-State-Vector Formalism: Deficit of Momentum Transfer in Scattering Processes
• Momentum and Energy Dependent Resolution Function of the ARCS Neutron Chopper Spectrometer at High Momentum Transfer: Comparing Simulation and Experimen
• Estimation of the condensate fraction from the static structure factor
• Local condensate depletion at trap center under strong interactions
• Temperature Dependence of the Vacancy Formation Energy in Solid ${}^4$He