title: Singularity in the thermal boundary resistance between superfluid (4)He and a solid surface.
abstract: We report new measurements in four cells of the thermal boundary resistance R between copper and (4)He below but near the superfluid-transition temperature T(lambda). For 10(-7)< or =t identical to 1-T/T(lambda))< or =10(-4) fits of R = R(0)t(-x(b))+R(B) to the data yielded x(b) approximately equal to 0.18, whereas a fit to theoretical values based on the renormalization-group theory yielded x(b) = 0.23. Alternatively, a good fit of the theory to the data could be obtained if the amplitude of the prediction was reduced by a factor close to 2. The results raise the question whether the boundary conditions used in the theory should be modified.
authors.affiliation: Department of Physics and iQUEST, University of California, Santa Barbara, CA 93106, USA.
authors.forename: Kerry
authors.initials: K
authors.lastname: Kuehn
authors.forename: Sarabjit
authors.initials: S
authors.lastname: Mehta
authors.forename: Haiying
authors.initials: H
authors.lastname: Fu
authors.forename: Edgar
authors.initials: E
authors.lastname: Genio
authors.forename: Daniel
authors.initials: D
authors.lastname: Murphy
authors.forename: Fengchuan
authors.initials: F
authors.lastname: Liu
authors.forename: Yuanming
authors.initials: Y
authors.lastname: Liu
authors.forename: Guenter
authors.initials: G
authors.lastname: Ahlers