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Measurements of critical current of superfluid 4He through an array of submicron apertures very near Tlambda

Far from the lambda transition the critical flow of superfluid 4He through a small orifice is determined by thermal nucleation of quantized vortices. Between 300 mK and 2 K linearly decreasing critical flow velocity has been observed earlier. As the temperature approaches Tlambda the size of the vor... Full description

Published: New York, Kluwer Academic/Plenum Publishers, 2000
Kongresse: International Symposium on Quantum Fluids and Solids 2000 2000.06.06-2000.06.11 Minneapolis, MN, US
QFS 2000 2000.06.06-2000.06.11 Minneapolis, MN, US
International Symposium on Quantum Fluids and Solids 2000.06.06-2000.06.11 Minneapolis, MN, US
QFS 2000 2000.06.06-2000.06.11 Minneapolis, MN, US
Contained in: Journal of Low Temperature Physics Vol. 121, No. 5-6 (2000), p. 665-670
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ISSN: 0022-2291
Additional Keywords: ELEKTRONENSTRAHLLITHOGRAPHIE
FLUESSIGHELIUM
KEIMAUSBILDUNG
KRITISCHER-STROM
REAKTIVES-IONENAETZEN
TEMPERATUREINFLUSS
UEBERGANGSTEMPERATUR
Notes: Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG
Copyright: (C) Alle Rechte beim Herausgeber
Physical Description: 6 Seiten, 11 Quellen
PPN (Catalogue-ID): WTI038053802
Note: WTI TEMA DB
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520 |a Far from the lambda transition the critical flow of superfluid 4He through a small orifice is determined by thermal nucleation of quantized vortices. Between 300 mK and 2 K linearly decreasing critical flow velocity has been observed earlier. As the temperature approaches Tlambda the size of the vortex core increases and becomes comparable to that of the orifice. We report here measurements of the critical mass current in this temperature range. An array of 24 3 x 0.17 my m holes in parallel with a macroscopic parallel path and flexible-diaphragm Helmholtz resonator have been used. The temperature range explored was from approximately = 80 mK to approximately = 20 my K below Tlambda. Preliminary analysis of the data shows that for a reduced temperature t = (Tlambda - T)/Tlambda >= 1 dot 10-4 the critical current scales approximately as t1.25. Closer to Tlambda the critical phase difference across the array becomes comparable to 2 pi and the results have to be analyzed in terms of Josephson effect. The superfluid density has been measured at the same time as the critical current. 
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