Sound Attenuation Measurements in Superfluid-Well below: An Anomalous Behavior at Low Pressure
- 6 September 1982
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 49 (10) , 744-747
- https://doi.org/10.1103/physrevlett.49.744
Abstract
Sound attenuation has been measured at low and medium pressures down to in the phase of superfluid stabilized by a magnetic field. Damping is due to Cooper pair breaking and constitutes a useful probe of the superfluid gap. The gap parameter is found to correspond to the weak-coupling value at high pressure but to be anomalously small at low pressure.
Keywords
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