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We find that a temperature differential can drive superfluid oscillations in4He. The oscillations are excited by a heater which causes a time dependenttemperature differential across an array of 70nm apertures. By measuring theoscillation frequency and simultaneously determining both temperature andpressure differentials we prove the validity of the most general form of theJosephson frequency relation. These observations were made near saturated vaporpressure, within a few mK of the superfluid transition temperature.Comment: 12 pages, 3 figure

physical review letters

Thermally Driven Josephson Oscillations in Superfluid<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">H</mml:mi><mml:mprescripts /><mml:none /><mml:mn>4</mml:mn></mml:mmultiscripts><mml:mi mathvariant="normal">e</mml:mi></mml:math>

Thermally Driven Josephson Oscillations in SuperfluidH4e