%0 Journal Article
%J Physical Review B
%D 2009
%T Limits on Bose-Einstein condensation in confined solid He-4
%A Diallo, S. O.
%A Azuah, R. T.
%A Kirichek, O.
%A Taylor, J. W.
%A Glyde, H. R.
%K bose-einstein condensation
%K neutron diffraction
%K phase
%K solid helium
%K state
%K superfluidity
%K supersolid helium
%K transition
%M ISI:000269638800013
%P 060504
%R 10.1103/Physrevb.80.060504
%U ://000269638800013
%V 80
%X 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.
%Z 492EXTimes Cited:0Cited References Count:37
%8 08/01
%@ 1098-0121