Showing papers in "Physical Review in 1980"

Studies of the Decay of Persistent Currents in Unsaturated Films of Superfluid 4He

Abstract: We report the results of systematic measurements of the decay of persistent currents of superfluid /sup 4/He films as a function of both temperature and film thickness. For film currents where the fractional decay per decade is less than 20%, the data can be represented by v=v/sub 0/(1-xi x ln(t/t/sub 0/)). For stronger decays we document deviations for the lnt behavior and observe that the empirical rule v=A(B+t)/sup -n/ reasonably represents the data over the full range of our studies. The Iordanskii-Langer-Fisher thermal fluctuation theory is examined in the vortex pair model, and inadequacies of the theory are discussed. A comparison is also made to the predictions of Donnelly, Hills, and Roberts.