Abstract
We have measured the speed of second soundu 2 in He II in the presence of a heat fluxQ. ForT fλ−1 mK>T>T fλ−3.5 mK it is found thatu 2 reduces linearly withQ 2, for 2 mW/cm2<Q<6 mW/cm2. By extrapolating the data we have deduced that the lambda transition temperature reduces linearly withQ.
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Bhagat, S.M., Davis, R.S. Influence of a dc heat flux on the velocity of second sound nearT fλ . J Low Temp Phys 7, 157–167 (1972). https://doi.org/10.1007/BF00629126
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DOI: https://doi.org/10.1007/BF00629126