TY - JOUR
T1 - Boundary conditions and critical Casimir forces in helium
AU - Garcia, R.
AU - Chan, M. H.W.
N1 - Funding Information:
We thank H. Meyer for providing unpublished pressure data used in some of our calculations. We thank M. Krech and G. Williams for providing their calculations of ϑ ahead of publication. We also thank M. Cole, K. Knorr, and N. Mulders for informative discussions. This work was supported by NASA's Office of Biological and Physical Research under NAG8-1761.
PY - 2003/5
Y1 - 2003/5
N2 - If a fluid near its critical point is confined between two interfaces, the long-ranged critical fluctuations in the order parameter will mediate a force. This force, known as the critical Casimir force, is a direct analog of the Casimir force in electromagnetism. Dielectric constant measurements of helium films adsorbed on Cu electrodes provide evidence for the existence of the critical Casimir force near the superfluid transition in 4He and near the tricritical point in 3He-4He mixtures. In pure 4He, we find the force is attractive but near the tricritical point the force appears repulsive, a change due to the extraordinary boundary conditions at the tricritical point.
AB - If a fluid near its critical point is confined between two interfaces, the long-ranged critical fluctuations in the order parameter will mediate a force. This force, known as the critical Casimir force, is a direct analog of the Casimir force in electromagnetism. Dielectric constant measurements of helium films adsorbed on Cu electrodes provide evidence for the existence of the critical Casimir force near the superfluid transition in 4He and near the tricritical point in 3He-4He mixtures. In pure 4He, we find the force is attractive but near the tricritical point the force appears repulsive, a change due to the extraordinary boundary conditions at the tricritical point.
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U2 - 10.1016/S0921-4526(02)01975-0
DO - 10.1016/S0921-4526(02)01975-0
M3 - Conference article
AN - SCOPUS:17344392968
SN - 0921-4526
VL - 329-333
SP - 238
EP - 241
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
T2 - Proceedings of the 23rd international conference on low temper
Y2 - 20 August 2002 through 27 August 2002
ER -