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Crossover of dissipation mechanism in flowing superfluid /sup 3/He-B near the tricritical pressure

Journal Article · · Phys. Rev. Lett.; (United States)
dc flow of superfluid /sup 3/He-B through a rectangular superleak exhibits two dissipative regimes and two critical currents with temperature dependence of the form J/sub c/ = b(1-T/T/sub c/)/sup a/. At low pressures aapprox. =(3/2) and b increases with pressure. Around 21.5 bars a crossover occurs to a new dissipation regime with aapprox. =2 and the prefactor b then decreases with pressure.
Research Organization:
Physics Laboratory, University of Sussex, Brighton BN19QH, Sussex, England
OSTI ID:
6528762
Journal Information:
Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 53:9; ISSN PRLTA
Country of Publication:
United States
Language:
English