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Pressure dependence of vortex tunneling in He II.

Research output: Contribution to journalJournal article

Published

Journal publication date08/1990
JournalPhysica B: Condensed Matter
Journal number1
Volume165-16
Number of pages2
Pages757-758
Original languageEnglish

Abstract

Measurements of the rate nu at which negative ions nucleate charged vortex rings in isotopically pure superfluid He-4 for electric fields E, temperatures T and pressures P within the ranges 10^3 < E < 10^6 V/m, 75 < T < 500 mK, 12 < P < 23 bar show that the energy barrier impeding the tunneling process is strongly dependent on pressure. Minima observed in nu(T) are ascribed to phonon damping.

Bibliographic note

Proceedings of the 19th International Conference on Low Temperature Physics (LT19), Brighton, 16-22 August 1990.