Thermally Driven Josephson Oscillations in Superfluid H4e
E. Hoskinson, R. E. Packard
DOI 10.1103/PhysRevLett.94.155303 · Physical Review Letters
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Abstract
We find that a temperature differential can drive superfluid oscillations in H4e. The oscillations are excited by a heater which causes a time dependent temperature differential across an array of 70 nm apertures. By measuring the oscillation frequency and simultaneously determining both temperature and pressure differentials we prove the validity of the most general form of the Josephson frequency relation. These observations were made near saturated vapor pressure, within a few mK of the superfluid transition temperature.
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