Experiments are described which show that liquid He II can persist in metastable thermodynamic states with a degree of superheating considerably larger than previously observed. A unique response is observed when the superheated He II undergoes the phase transition to He I. These results provide unique data for the extension of the λ line into the metastable region of the phase diagram.
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Work supported by the National Science foundation grant DMR 7925089.
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Rybarcyk, L.J., Tough, J.T. Superheating in He II and the extension of the lambda line. J Low Temp Phys 43, 197–202 (1981). https://doi.org/10.1007/BF00118631
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DOI: https://doi.org/10.1007/BF00118631