Specific heat of helium confined to a 57- &mgr;m planar geometry near the lambda point
We report measurements of the specific heat of liquid helium confined to 57-&mgr;m planar gaps extending to within a few nanokelvin of the bulk lambda transition. The data are in fair agreement with Monte Carlo estimates for finite-size effects and with renormalization-group-theory predictions above the transition. Far from the transition, we find surface specific heat exponents, alpha(s) = 0.64+/-0.05 below, and 0.65+/-0.2 above, which compare well with the prediction of 0.658. Comparison with other recent data on small length scales shows some areas of agreement.
Lipa
JA
Department of Physics, Stanford University, Stanford, California 94305, USA.
Swanson
DR
Nissen
JA
Geng
ZK
Williamson
PR
Stricker
DA
Chui
TC
Israelsson
UE
Larson
M