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Full-Text Articles in Physical Sciences and Mathematics
Temperature Dependent Spatial Order In Superfluid And Normal 4he, Robert Hallock, H. N. Robkoff, D. A. Ewen
Temperature Dependent Spatial Order In Superfluid And Normal 4he, Robert Hallock, H. N. Robkoff, D. A. Ewen
Robert Hallock
Measurements of the structure factor S(k) for 4He at constant density above and below Tλ are reported. The results show a clear loss of spatial order on cooling through Tλ. Application of the theory of Cummings, Hyland, and Rowlands to the data allows a measurement of the condensate fraction for He II.
Behavior Of Persistent Currents Under Conditions Of Strong Decay, Robert Hallock, D. T. Ekholm
Behavior Of Persistent Currents Under Conditions Of Strong Decay, Robert Hallock, D. T. Ekholm
Robert Hallock
We report observations of the decay of persistent currents of thin superfluid 4He films for which the superfluid velocity deviates strongly from the previously observed logt behavior. We present data which document the evolution of this behavior as a function of film thickness. The Iordanskii-Langer-Fisher theory does not accurately describe our observation