Possible influence of thermal rotons on vortex nucleation by negative ions in pressurised He II below 1K
P C E Stamp; P V E McClintock; W M Fairbairn; P C E Stamp; Dept. of Phys., Univ. of Lancaster, Lancaster, UK; P V E McClintock; Dept. of Phys., Univ. of Lancaster, Lancaster, UK; W M Fairbairn; Dept. of Phys., Univ. of Lancaster, Lancaster, UK
Журнал:
Journal of Physics C: Solid State Physics
Дата:
1979-08-14
Аннотация:
A new technique has been developed for measuring the nucleation rate nu of negatively charged vortex rings in HeII when the temperature T, pressure P and electric field E are such that the bare-ion drift velocity is limited principally by roton emission. For P=25 bar, E=7.9*10<sup>5</sup> V m<sup>-1</sup> and 0.7<T<0.9K, the relation nu (T)=8.0*10<sup>7</sup> exp(-6.2/T) was obtained, which suggests that the magnitude of nu may be closely related to the thermal roton density.
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