Anomalous dissipation near T{sub {lambda}} under a large heat flux
- Department of Physics, Duke University, Durham, North Carolina 27708-0305 (United States)
We report on thermal transport experiments in liquid {sup 4}He near T{sub {lambda}} using heat fluxes 8{le}Q{le}55{mu}W/cm{sup 2}. We have confirmed the presence of a region near the superfluid transition, reported by Liu and Ahlers [Phys. Rev. Lett {bold 76}, 1300 (1996)], in which thermal dissipation is anomalously small. The temperature transients for reaching a steady state upon entering this region from the superfluid side or cooling back into the superfluid have been studied, and are found to be quite different from each other; one possible explanation for this behavior is proposed which implies that the region of anomalous dissipation has a low thermal diffusivity. We discuss the location of this region in the phase diagram of liquid {sup 4}He. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 565893
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 57, Issue 1; Other Information: PBD: Jan 1998
- Country of Publication:
- United States
- Language:
- English
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