High frequency acoustic measurements in liquid3He near the transition temperature |
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| Authors: | Y. Lee P. J. Hamot D. T. Sprague T. M. Haard J. B. Kycia M. R. Rand M. W. Meisel W. P. Halperin |
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| Affiliation: | (1) Department of Physics and Astronomy, Northwestern University, 60208 Evanston, IL, USA;(2) Present address: Department of Physics, University of Florida, 32611 Gainesville, FL, USA |
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| Abstract: | We have made accurate measurements of the phase velocity in liquid3He at 0.6 bar near Tc using a path length modulation technique. The frequency used in this measurement (113 MHz) is much higher than any of the collective mode frequencies and well above the threshold for pair-breaking,    and > 20. We have observed a sharp but small linear increase in the phase velocity below Tc and a small decrease from the expected behavior in the normal fluid region very close to the transition temperature.We would like to thank Prof. Sauls for useful discussions. This work has been supported by the National Science Foundatibn Low Temperature Physics Program through DMR-9314025 and DMR-9200671. |
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