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Pressure dependence of vortex tunneling in He II.

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>08/1990
<mark>Journal</mark>Physica B: Condensed Matter
Number of pages2
<mark>Original language</mark>English


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.