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Pressure dependence of the Landau critical velocity in He II: a progress report.

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Abstract

Precise measurements of the Landau critical velocity vL in Hell are reported for pressures P in the range 13 < P < 25 bar. They agree within experimental error with predictions derived from accepted values of the roton parameters.

Bibliographic note

Proceedings of the 17th International Conference on Low Temperature Physics, Karlsruhe, 15-22 August 1984.