Quantitative studies of nonlinear second sound in superfluid sup 4 He

Journal Article · Sat Jun 01 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.12861· OSTI ID:5466514

Goldner, L S; Ahlers, G; Mehrotra, R ^[1]

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1. Department of Physics and Center for Nonlinear Sciences, University of California, Santa Barbara, California 93106 (USA)

Experimental studies of the nonlinear evolution in time of planar second-sound pulses in superfluid {sup 4}He have been carried out at temperatures 2 to 25 mK below {ital T}{sub {lambda}}. The pulse evolution in helium is compared to solutions of the Burgers equation, and corrections for the effect of the heater and bolometer substrates are made by numerical integration of the heat-diffusion equation with appropriate boundary conditions. Agreement between measured and calculated pulse shapes is found to be excellent. Fits to the data of the model are used to obtain the linear second-sound velocity. A new method for studying the critical behavior of second sound very close to {ital T}{sub {lambda}}, where nonlinear effects are always important, is suggested.

• OSTI ID: 5466514
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:16; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
EVEN-EVEN NUCLEI
FLUIDS
HELIUM 4
HELIUM II
HELIUM ISOTOPES
ISOTOPES
LAMBDA POINT
LIGHT NUCLEI
NONLINEAR PROBLEMS
NUCLEI
PHYSICAL PROPERTIES
PULSES
QUANTUM FLUIDS
SECOND SOUND
STABLE ISOTOPES
SUPERFLUIDITY
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
WAVE PROPAGATION