Ultrasound attenuation of superfluid $^{3}$He in aerogel

Details Ultrasound attenuation of superfluid $^{3}$He in aerogel Ultrasound attenuation of superfluid $^{3}$He in aerogel

2007-04-03

arxiv.org/abs/0704.0419v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures. Submitted to PRL

Scientific paper

10.1103/PhysRevLett.98.225301

We have performed longitudinal ultrasound (9.5 MHz) attenuation measurements in the B-phase of superfluid $^3$He 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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