Limits on Bose-Einstein condensation in confined solid He-4

TitleLimits on Bose-Einstein condensation in confined solid He-4
Publication TypeJournal Article
Year of Publication2009
AuthorsDiallo SO, Azuah RT, Kirichek O, Taylor JW, Glyde HR
Journal TitlePhysical Review B
Date Published08/01
ISBN Number1098-0121
Accession NumberISI:000269638800013
Keywordsbose-einstein condensation, neutron diffraction, phase, solid helium, state, superfluidity, supersolid helium, transition

We report neutron-scattering measurements of the Bose-Einstein condensate (BEC) fraction, n(0), in solid helium that has a large surface to volume (S/V) ratio. Rittner and Reppy observed large superfluid fractions, rho(S)/rho, in large S/V samples with rho(S)/rho approximately proportional to S/V, up to rho(S)/rho=20% at S/V=150 cm(-1). Our goal is to reveal whether there is BEC associated with these large rho(S)/rho. Our solid volume is 100 cm(3) of commercial grade helium at 41 bars pressure (T-c similar or equal to 200 mK) in a cell that has S/V=40 cm(-1) that cannot be quenched rapidly. We find no evidence for BEC or algebraic off diagonal long-range order with n(0)=0.0 +/- 0.3% at 65 mK.

URL<Go to ISI>://000269638800013