Thermally Driven Josephson Oscillations in Superfluid 4He

Details Thermally Driven Josephson Oscillations in Superfluid 4He Thermally Driven Josephson Oscillations in Superfluid 4He

2005-04-25

arxiv.org/abs/cond-mat/0504643v1

Phys. Rev. Lett. 94, 155303 (2005)

Physics

Condensed Matter

Superconductivity

12 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.94.155303

We find that a temperature differential can drive superfluid oscillations in 4He. The oscillations are excited by a heater which causes a time dependent temperature differential across an array of 70nm 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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