Ultrasound attenuation of superfluid 3He in aerogel |
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Authors: | Choi H C Masuhara N Moon B H Bhupathi P Meisel M W Lee Y Mulders N Higashitani S Miura M Nagai K |
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Institution: | Microkelvin Laboratory, Department of Physics, University of Florida, Gainesville, Florida 32611-8440, USA. |
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Abstract: | We have performed longitudinal ultrasound (9.5 MHz) attenuation measurements in the B phase of superfluid 3He in 98% porosity aerogel down to the zero temperature limit for a wide range of pressures at zero magnetic field. The absolute attenuation was determined by direct transmission of sound pulses. Compared to the bulk fluid, our results revealed a drastically different behavior in attenuation, which is consistent with theoretical accounts with gapless excitations and a collision drag effect. |
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