Superleak transducers of second sound in sup 3 He- sup 4 He mixtures

Journal Article · Fri Feb 01 04:00:00 EST 1991 · Journal of Low Temperature Physics; (United States)

DOI:https://doi.org/10.1007/BF00681527· OSTI ID:5363617

Henjes, K; Liu, M ^[1]

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1. Univ. Hannover (West Germany)

In a recent second-sound experiment in a dilute {sup 3}H-{sup 4}He mixture, Church et al. were able to understand most of their data with the theory by d'Humieres, Launay, and Libchaber. However, significant discrepancies exist at lower frequencies. The authors show that diffusive currents across the superleak are responsible for this deviation. What is more, they are able to determine the diffusion coefficient D from the low-frequency data. The equations governing the performance of oscillating superleak transducers and Peshkov transducers are derived in a systematic manner. This pertains to pure He-II as well as to mixtures. Mistakes in earlier works on dissipative effects of superleak transducers are corrected. Explicit formulas are given for the amplitude and linewidth of second sound, and the experimentally relevant parameters are discussed.

• OSTI ID: 5363617
• Journal Information: Journal of Low Temperature Physics; (United States), Journal Name: Journal of Low Temperature Physics; (United States) Vol. 82:3-4; ISSN 0022-2291; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

661210 -- Cryogenics-- (1992-)
665420* -- Superfluidity-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DISPERSIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FLUIDS
HELIUM 3
HELIUM 4
HELIUM II
HELIUM ISOTOPES
ISOTOPES
LEAKS
LIGHT NUCLEI
MIXTURES
NUCLEI
PERFORMANCE
QUANTUM FLUIDS
SECOND SOUND
STABLE ISOTOPES
SUPERFLUIDITY
TRANSDUCERS