Ultrasound attenuation of superfluid 3He in aerogel
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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